DevTools: Refactor InspectUI class for extensibility

chrome/browser/ui/webui/inspect_ui.cc

Index: chrome/browser/ui/webui/inspect_ui.cc
diff --git a/chrome/browser/ui/webui/inspect_ui.cc b/chrome/browser/ui/webui/inspect_ui.cc
index f03d39847165ab127b8d03782e8d0aac2f6cfaee..e9b9bddc7b2804c463171f0a2dacf9c754c9100f 100644
--- a/chrome/browser/ui/webui/inspect_ui.cc
+++ b/chrome/browser/ui/webui/inspect_ui.cc
@@ -4,72 +4,31 @@
 
 #include "chrome/browser/ui/webui/inspect_ui.h"
 
-#include <set>
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/json/json_writer.h"
-#include "base/memory/ref_counted_memory.h"
 #include "base/prefs/pref_service.h"
 #include "base/stl_util.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_util.h"
-#include "base/strings/stringprintf.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/values.h"
-#include "chrome/browser/devtools/devtools_target_impl.h"
-#include "chrome/browser/devtools/port_forwarding_controller.h"
+#include "chrome/browser/devtools/devtools_adb_bridge.h"
+#include "chrome/browser/devtools/devtools_targets_ui.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/singleton_tabs.h"
-#include "chrome/browser/ui/tab_contents/tab_contents_iterator.h"
 #include "chrome/browser/ui/webui/theme_source.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
-#include "content/public/browser/browser_child_process_observer.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/child_process_data.h"
-#include "content/public/browser/devtools_agent_host.h"
-#include "content/public/browser/devtools_client_host.h"
-#include "content/public/browser/devtools_manager.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
-#include "content/public/browser/render_process_host.h"
-#include "content/public/browser/render_view_host.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "content/public/browser/web_ui_message_handler.h"
-#include "content/public/browser/worker_service.h"
-#include "content/public/browser/worker_service_observer.h"
-#include "content/public/common/process_type.h"
 #include "grit/browser_resources.h"
-#include "grit/generated_resources.h"
-#include "net/base/escape.h"
-#include "net/base/net_errors.h"
-#include "ui/base/resource/resource_bundle.h"
-
-using content::BrowserThread;
-using content::ChildProcessData;
-using content::DevToolsAgentHost;
-using content::DevToolsClientHost;
-using content::DevToolsManager;
-using content::RenderProcessHost;
-using content::RenderViewHost;
-using content::RenderViewHostDelegate;
-using content::RenderWidgetHost;
+
 using content::WebContents;
 using content::WebUIMessageHandler;
-using content::WorkerService;
-using content::WorkerServiceObserver;
 
 namespace {
 
-const char kWorkerTargetType[]  = "worker";
-const char kAdbTargetType[]  = "adb_page";
-
 const char kInitUICommand[]  = "init-ui";
 const char kInspectCommand[]  = "inspect";
 const char kActivateCommand[]  = "activate";
@@ -87,43 +46,6 @@ const char kPortForwardingConfigCommand[] = "set-port-forwarding-config";
 const char kPortForwardingDefaultPort[] = "8080";
 const char kPortForwardingDefaultLocation[] = "localhost:8080";
 
-const char kTargetIdField[]  = "id";
-const char kTargetTypeField[]  = "type";
-const char kAttachedField[]  = "attached";
-const char kUrlField[]  = "url";
-const char kNameField[]  = "name";
-const char kFaviconUrlField[] = "faviconUrl";
-const char kDescription[] = "description";
-const char kAdbConnectedField[] = "adbConnected";
-const char kAdbModelField[] = "adbModel";
-const char kAdbSerialField[] = "adbSerial";
-const char kAdbBrowserNameField[] = "adbBrowserName";
-const char kAdbBrowserVersionField[] = "adbBrowserVersion";
-const char kAdbBrowserChromeVersionField[] = "adbBrowserChromeVersion";
-const char kAdbGlobalIdField[] = "adbGlobalId";
-const char kAdbBrowsersField[] = "browsers";
-const char kAdbPagesField[] = "pages";
-const char kAdbPackagesField[] = "packages";
-const char kAdbPortStatus[] = "adbPortStatus";
-const char kAdbScreenWidthField[] = "adbScreenWidth";
-const char kAdbScreenHeightField[] = "adbScreenHeight";
-const char kAdbAttachedForeignField[]  = "adbAttachedForeign";
-const char kGuestList[] = "guests";
-
-DictionaryValue* BuildTargetDescriptor(
-    const DevToolsTargetImpl& target) {
-  DictionaryValue* target_data = new DictionaryValue();
-  target_data->SetString(kTargetIdField, target.GetId());
-  target_data->SetString(kTargetTypeField, target.GetType());
-  target_data->SetBoolean(kAttachedField, target.IsAttached());
-  target_data->SetString(kUrlField, target.GetUrl().spec());
-  target_data->SetString(kNameField, net::EscapeForHTML(target.GetTitle()));
-  target_data->SetString(kFaviconUrlField, target.GetFaviconUrl().spec());
-  target_data->SetString(kDescription, target.GetDescription());
-
-  return target_data;
-}
-
 class InspectMessageHandler : public WebUIMessageHandler {
  public:
   explicit InspectMessageHandler(InspectUI* inspect_ui)
@@ -145,8 +67,6 @@ class InspectMessageHandler : public WebUIMessageHandler {
                                 const ListValue* args);
   void HandlePortForwardingConfigCommand(const ListValue* args);
 
-  DevToolsTargetImpl* FindTarget(const ListValue* args);
-
   InspectUI* inspect_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(InspectMessageHandler);
@@ -191,78 +111,57 @@ void InspectMessageHandler::HandleInitUICommand(const ListValue*) {
   inspect_ui_->InitUI();
 }
 
+static bool ParseStringArgs(const ListValue* args,
+                            std::string* arg0,
+                            std::string* arg1,
+                            std::string* arg2 = 0) {
+  int arg_size = args->GetSize();
+  return (!arg0 || (arg_size > 0 && args->GetString(0, arg0))) &&
+         (!arg1 || (arg_size > 1 && args->GetString(1, arg1))) &&
+         (!arg2 || (arg_size > 2 && args->GetString(2, arg2)));
+}
+
 void InspectMessageHandler::HandleInspectCommand(const ListValue* args) {
-  Profile* profile = Profile::FromWebUI(web_ui());
-  if (!profile)
-    return;
-  DevToolsTargetImpl* target = FindTarget(args);
-  if (target)
-    target->Inspect(profile);
+  std::string source;
+  std::string id;
+  if (ParseStringArgs(args, &source, &id))
+    inspect_ui_->Inspect(source, id);
 }
 
 void InspectMessageHandler::HandleActivateCommand(const ListValue* args) {
-  DevToolsTargetImpl* target = FindTarget(args);
-  if (target)
-    target->Activate();
+  std::string source;
+  std::string id;
+  if (ParseStringArgs(args, &source, &id))
+    inspect_ui_->Activate(source, id);
 }
 
 void InspectMessageHandler::HandleCloseCommand(const ListValue* args) {
-  DevToolsTargetImpl* target = FindTarget(args);
-  if (target)
-    target->Close();
+  std::string source;
+  std::string id;
+  if (ParseStringArgs(args, &source, &id))
+    inspect_ui_->Close(source, id);
 }
 
 void InspectMessageHandler::HandleReloadCommand(const ListValue* args) {
-  DevToolsTargetImpl* target = FindTarget(args);
-  if (target)
-    target->Reload();
+  std::string source;
+  std::string id;
+  if (ParseStringArgs(args, &source, &id))
+    inspect_ui_->Reload(source, id);
 }
 
 void InspectMessageHandler::HandleOpenCommand(const ListValue* args) {
-  if (args->GetSize() != 2)
-    return;
+  std::string source_id;
   std::string browser_id;
-  if (!args->GetString(0, &browser_id))
-    return;
-  scoped_refptr<DevToolsAdbBridge::RemoteBrowser> remote_browser =
-      inspect_ui_->FindRemoteBrowser(browser_id);
-  if (!remote_browser)
-    return;
   std::string url;
-  if (!args->GetString(1, &url))
-    return;
-  GURL gurl(url);
-  if (!gurl.is_valid()) {
-    gurl = GURL("http://" + url);
-    if (!gurl.is_valid())
-     return;
-  }
-  remote_browser->Open(gurl.spec());
+  if (ParseStringArgs(args, &source_id, &browser_id, &url))
+    inspect_ui_->Open(source_id, browser_id, url);
 }
 
 void InspectMessageHandler::HandleLaunchCommand(const ListValue* args) {
-  if (args->GetSize() != 1)
-    return;
+  std::string source_id;
   std::string package_id;
-  if (!args->GetString(0, &package_id))
-    return;
-  scoped_refptr<DevToolsAdbBridge::RemotePackage> remote_package =
-      inspect_ui_->FindRemotePackage(package_id);
-  if (!remote_package)
-    return;
-  remote_package->Launch();
-}
-
-DevToolsTargetImpl* InspectMessageHandler::FindTarget(const ListValue* args) {
-  const DictionaryValue* data;
-  std::string type;
-  std::string id;
-  if (args->GetSize() == 1 && args->GetDictionary(0, &data) &&
-      data->GetString(kTargetTypeField, &type) &&
-      data->GetString(kTargetIdField, &id)) {
-    return inspect_ui_->FindTarget(type, id);
-  }
-  return NULL;
+  if (ParseStringArgs(args, &source_id, &package_id))
+    inspect_ui_->Launch(source_id, package_id);
 }
 
 void InspectMessageHandler::HandleBooleanPrefChanged(
@@ -290,94 +189,6 @@ void InspectMessageHandler::HandlePortForwardingConfigCommand(
 
 }  // namespace
 
-class InspectUI::WorkerCreationDestructionListener
-    : public WorkerServiceObserver,
-      public content::BrowserChildProcessObserver,
-      public base::RefCountedThreadSafe<WorkerCreationDestructionListener> {
- public:
-  WorkerCreationDestructionListener()
-      : discovery_ui_(NULL) {}
-
-  void Init(InspectUI* workers_ui) {
-    DCHECK(workers_ui);
-    DCHECK(!discovery_ui_);
-    discovery_ui_ = workers_ui;
-    BrowserChildProcessObserver::Add(this);
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
-        base::Bind(&WorkerCreationDestructionListener::RegisterObserver,
-                   this));
-  }
-
-  void InspectUIDestroyed() {
-    DCHECK(discovery_ui_);
-    discovery_ui_ = NULL;
-    BrowserChildProcessObserver::Remove(this);
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
-        base::Bind(&WorkerCreationDestructionListener::UnregisterObserver,
-                   this));
-  }
-
-  void UpdateUI() {
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
-        base::Bind(&WorkerCreationDestructionListener::CollectWorkersData,
-                   this));
-  }
-
- private:
-  friend class base::RefCountedThreadSafe<WorkerCreationDestructionListener>;
-  virtual ~WorkerCreationDestructionListener() {}
-
-  virtual void WorkerCreated(
-      const GURL& url,
-      const string16& name,
-      int process_id,
-      int route_id) OVERRIDE {
-    CollectWorkersData();
-  }
-
-  virtual void WorkerDestroyed(int process_id, int route_id) OVERRIDE {
-    CollectWorkersData();
-  }
-
-  virtual void BrowserChildProcessHostConnected(
-      const content::ChildProcessData& data) OVERRIDE {
-    if (data.process_type == content::PROCESS_TYPE_WORKER)
-      UpdateUI();
-  }
-
-  virtual void BrowserChildProcessHostDisconnected(
-      const content::ChildProcessData& data) OVERRIDE {
-    if (data.process_type == content::PROCESS_TYPE_WORKER)
-      UpdateUI();
-  }
-
-  void CollectWorkersData() {
-    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
-    DevToolsTargetImpl::EnumerateWorkerTargets(
-        base::Bind(
-            &WorkerCreationDestructionListener::PopulateWorkersList, this));
-  }
-
-  void RegisterObserver() {
-    WorkerService::GetInstance()->AddObserver(this);
-  }
-
-  void UnregisterObserver() {
-    WorkerService::GetInstance()->RemoveObserver(this);
-  }
-
-  void PopulateWorkersList(const DevToolsTargetImpl::List& targets) {
-    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-    if (discovery_ui_)
-       discovery_ui_->PopulateWorkerTargets(targets);
-  }
-
-  InspectUI* discovery_ui_;
-};
-
 InspectUI::InspectUI(content::WebUI* web_ui)
     : WebUIController(web_ui) {
   web_ui->AddMessageHandler(new InspectMessageHandler(this));
@@ -391,150 +202,93 @@ InspectUI::InspectUI(content::WebUI* web_ui)
 
 InspectUI::~InspectUI() {
   StopListeningNotifications();
-  STLDeleteValues(&render_view_host_targets_);
 }
 
 void InspectUI::InitUI() {
   SetPortForwardingDefaults();
   StartListeningNotifications();
-  PopulateWebContentsTargets();
   UpdateDiscoverUsbDevicesEnabled();
   UpdatePortForwardingEnabled();
   UpdatePortForwardingConfig();
-  observer_->UpdateUI();
-}
-
-DevToolsTargetImpl* InspectUI::FindTarget(const std::string& type,
-                                          const std::string& id) {
-  if (type == kWorkerTargetType) {
-    TargetMap::iterator it = worker_targets_.find(id);
-    return it == worker_targets_.end() ? NULL : it->second;
-  } else if (type == kAdbTargetType) {
-    TargetMap::iterator it = remote_targets_.find(id);
-    return it == remote_targets_.end() ? NULL : it->second;
-  } else {
-    TargetMap::iterator it = render_view_host_targets_.find(id);
-    return it == render_view_host_targets_.end() ? NULL : it->second;
-  }
 }
 
-scoped_refptr<DevToolsAdbBridge::RemoteBrowser>
-InspectUI::FindRemoteBrowser(const std::string& id) {
-  RemoteBrowsers::iterator it = remote_browsers_.find(id);
-  return it == remote_browsers_.end() ? NULL : it->second;
+void InspectUI::Inspect(const std::string& source_id,
+                        const std::string& target_id) {
+  DevToolsTargetsUIHandler* handler = FindTargetHandler(source_id);
+  if (handler)
+    handler->Inspect(target_id, Profile::FromWebUI(web_ui()));
 }
 
-scoped_refptr<DevToolsAdbBridge::RemotePackage>
-InspectUI::FindRemotePackage(const std::string& id) {
-  RemotePackages::iterator it = remote_packages_.find(id);
-  return it == remote_packages_.end() ? NULL : it->second;
+void InspectUI::Activate(const std::string& source_id,
+                         const std::string& target_id) {
+  DevToolsTargetsUIHandler* handler = FindTargetHandler(source_id);
+  if (handler)
+    handler->Activate(target_id);
 }
 
-void InspectUI::InspectDevices(Browser* browser) {
-  content::RecordAction(content::UserMetricsAction("InspectDevices"));
-  chrome::NavigateParams params(chrome::GetSingletonTabNavigateParams(
-      browser, GURL(chrome::kChromeUIInspectURL)));
-  params.path_behavior = chrome::NavigateParams::IGNORE_AND_NAVIGATE;
-  ShowSingletonTabOverwritingNTP(browser, params);
+void InspectUI::Close(const std::string& source_id,
+                      const std::string& target_id) {
+  DevToolsTargetsUIHandler* handler = FindTargetHandler(source_id);
+  if (handler)
+    handler->Close(target_id);
 }
 
-void InspectUI::PopulateWebContentsTargets() {
-  ListValue list_value;
-
-  std::map<WebContents*, DictionaryValue*> web_contents_to_descriptor_;
-  std::vector<DevToolsTargetImpl*> guest_targets;
-
-  DevToolsTargetImpl::List targets =
-      DevToolsTargetImpl::EnumerateRenderViewHostTargets();
-
-  STLDeleteValues(&render_view_host_targets_);
-  for (DevToolsTargetImpl::List::iterator it = targets.begin();
-      it != targets.end(); ++it) {
-    scoped_ptr<DevToolsTargetImpl> target(*it);
-    RenderViewHost* rvh = target->GetRenderViewHost();
-    if (!rvh)
-      continue;
-    WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
-    if (!web_contents)
-      continue;
-
-    DevToolsTargetImpl* target_ptr = target.get();
-    render_view_host_targets_[target_ptr->GetId()] = target.release();
-    if (rvh->GetProcess()->IsGuest()) {
-      guest_targets.push_back(target_ptr);
-    } else {
-      DictionaryValue* descriptor = BuildTargetDescriptor(*target_ptr);
-      list_value.Append(descriptor);
-      web_contents_to_descriptor_[web_contents] = descriptor;
-    }
-  }
-
-  // Add the list of guest-views to each of its embedders.
-  for (std::vector<DevToolsTargetImpl*>::iterator it(guest_targets.begin());
-       it != guest_targets.end(); ++it) {
-    DevToolsTargetImpl* guest = (*it);
-    WebContents* guest_web_contents =
-        WebContents::FromRenderViewHost(guest->GetRenderViewHost());
-    WebContents* embedder = guest_web_contents->GetEmbedderWebContents();
-    if (embedder && web_contents_to_descriptor_.count(embedder) > 0) {
-      DictionaryValue* parent = web_contents_to_descriptor_[embedder];
-      ListValue* guests = NULL;
-      if (!parent->GetList(kGuestList, &guests)) {
-        guests = new ListValue();
-        parent->Set(kGuestList, guests);
-      }
-      guests->Append(BuildTargetDescriptor(*guest));
-    }
-  }
-
-  web_ui()->CallJavascriptFunction("populateWebContentsTargets", list_value);
+void InspectUI::Reload(const std::string& source_id,
+                       const std::string& target_id) {
+  DevToolsTargetsUIHandler* handler = FindTargetHandler(source_id);
+  if (handler)
+    handler->Reload(target_id);
 }
 
-void InspectUI::PopulateWorkerTargets(const DevToolsTargetImpl::List& targets) {
-  ListValue list_value;
+void InspectUI::Open(const std::string& source_id,
+                     const std::string& browser_id,
+                     const std::string& url) {
+  DevToolsRemoteTargetsUIHandler* handler = FindRemoteTargetHandler(source_id);
+  if (handler)
+    handler->Open(browser_id, url);
+}
 
-  STLDeleteValues(&worker_targets_);
-  for (DevToolsTargetImpl::List::const_iterator it = targets.begin();
-      it != targets.end(); ++it) {
-    DevToolsTargetImpl* target = *it;
-    list_value.Append(BuildTargetDescriptor(*target));
-    worker_targets_[target->GetId()] = target;
-  }
+void InspectUI::Launch(const std::string& source_id,
+                       const std::string& package_id) {
+  DevToolsRemoteTargetsUIHandler* handler = FindRemoteTargetHandler(source_id);
+  if (handler)
+    handler->Launch(package_id);
+}
 
-  web_ui()->CallJavascriptFunction("populateWorkerTargets", list_value);
+void InspectUI::InspectDevices(Browser* browser) {
+  content::RecordAction(content::UserMetricsAction("InspectDevices"));
+  chrome::NavigateParams params(chrome::GetSingletonTabNavigateParams(
+      browser, GURL(chrome::kChromeUIInspectURL)));
+  params.path_behavior = chrome::NavigateParams::IGNORE_AND_NAVIGATE;
+  ShowSingletonTabOverwritingNTP(browser, params);
 }
 
 void InspectUI::Observe(int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
-  if (source != content::Source<WebContents>(web_ui()->GetWebContents()))
-    PopulateWebContentsTargets();
-  else if (type == content::NOTIFICATION_WEB_CONTENTS_DISCONNECTED)
+  if (source == content::Source<WebContents>(web_ui()->GetWebContents()))
     StopListeningNotifications();
 }
 
 void InspectUI::StartListeningNotifications() {
-  if (observer_)
+  if (!target_handlers_.empty())
     return;
 
-  observer_ = new WorkerCreationDestructionListener();
-  observer_->Init(this);
-
   Profile* profile = Profile::FromWebUI(web_ui());
-  DevToolsAdbBridge* adb_bridge =
-      DevToolsAdbBridge::Factory::GetForProfile(profile);
-  if (adb_bridge)
-    adb_bridge->AddListener(this);
 
-  notification_registrar_.Add(this,
-                              content::NOTIFICATION_WEB_CONTENTS_CONNECTED,
-                              content::NotificationService::AllSources());
+  DevToolsTargetsUIHandler::Callback callback =
+      base::Bind(&InspectUI::PopulateTargets, base::Unretained(this));
+
+  AddTargetUIHandler(
+      DevToolsTargetsUIHandler::CreateForRenderers(callback));
+  AddTargetUIHandler(
+      DevToolsTargetsUIHandler::CreateForWorkers(callback));
+  AddRemoteTargetUIHandler(
+      DevToolsRemoteTargetsUIHandler::CreateForAdb(callback, profile));
+
   notification_registrar_.Add(this,
                               content::NOTIFICATION_WEB_CONTENTS_DISCONNECTED,
                               content::NotificationService::AllSources());
-  notification_registrar_.Add(this,
-                              content::NOTIFICATION_WEB_CONTENTS_DESTROYED,
-                              content::NotificationService::AllSources());
 
   pref_change_registrar_.Init(profile->GetPrefs());
   pref_change_registrar_.Add(prefs::kDevToolsDiscoverUsbDevicesEnabled,
@@ -548,17 +302,13 @@ void InspectUI::StartListeningNotifications() {
                  base::Unretained(this)));
 }
 
-void InspectUI::StopListeningNotifications()
-{
-  if (!observer_.get())
+void InspectUI::StopListeningNotifications() {
+  if (target_handlers_.empty())
     return;
-  Profile* profile = Profile::FromWebUI(web_ui());
-  DevToolsAdbBridge* adb_bridge =
-      DevToolsAdbBridge::Factory::GetForProfile(profile);
-  if (adb_bridge)
-    adb_bridge->RemoveListener(this);
-  observer_->InspectUIDestroyed();
-  observer_ = NULL;
+
+  STLDeleteValues(&target_handlers_);
+  STLDeleteValues(&remote_target_handlers_);
+
   notification_registrar_.RemoveAll();
   pref_change_registrar_.RemoveAll();
 }
@@ -572,117 +322,6 @@ content::WebUIDataSource* InspectUI::CreateInspectUIHTMLSource() {
   return source;
 }
 
-void InspectUI::RemoteDevicesChanged(
-    DevToolsAdbBridge::RemoteDevices* devices) {
-  Profile* profile = Profile::FromWebUI(web_ui());
-  PortForwardingController* port_forwarding_controller =
-      PortForwardingController::Factory::GetForProfile(profile);
-  PortForwardingController::DevicesStatus port_forwarding_status;
-  if (port_forwarding_controller)
-    port_forwarding_status =
-        port_forwarding_controller->UpdateDeviceList(*devices);
-
-  remote_browsers_.clear();
-  remote_packages_.clear();
-  STLDeleteValues(&remote_targets_);
-  ListValue device_list;
-  for (DevToolsAdbBridge::RemoteDevices::iterator dit = devices->begin();
-       dit != devices->end(); ++dit) {
-    DevToolsAdbBridge::RemoteDevice* device = dit->get();
-    DictionaryValue* device_data = new DictionaryValue();
-    device_data->SetString(kAdbModelField, device->GetModel());
-    device_data->SetString(kAdbSerialField, device->GetSerial());
-    device_data->SetBoolean(kAdbConnectedField, device->IsConnected());
-    std::string device_id = base::StringPrintf(
-        "device:%s",
-        device->GetSerial().c_str());
-    device_data->SetString(kAdbGlobalIdField, device_id);
-    ListValue* browser_list = new ListValue();
-    device_data->Set(kAdbBrowsersField, browser_list);
-
-    DevToolsAdbBridge::RemoteBrowsers& browsers = device->browsers();
-    for (DevToolsAdbBridge::RemoteBrowsers::iterator bit =
-        browsers.begin(); bit != browsers.end(); ++bit) {
-      DevToolsAdbBridge::RemoteBrowser* browser = bit->get();
-      DictionaryValue* browser_data = new DictionaryValue();
-      browser_data->SetString(kAdbBrowserNameField, browser->display_name());
-      browser_data->SetString(kAdbBrowserVersionField, browser->version());
-      DevToolsAdbBridge::RemoteBrowser::ParsedVersion parsed =
-          browser->GetParsedVersion();
-      browser_data->SetInteger(
-          kAdbBrowserChromeVersionField,
-          browser->IsChrome() && !parsed.empty() ? parsed[0] : 0);
-      std::string browser_id = base::StringPrintf(
-          "browser:%s:%s:%s:%s",
-          device->GetSerial().c_str(), // Ensure uniqueness across devices.
-          browser->display_name().c_str(),  // Sort by display name.
-          browser->version().c_str(),  // Then by version.
-          browser->socket().c_str());  // Ensure uniqueness on the device.
-      browser_data->SetString(kAdbGlobalIdField, browser_id);
-      remote_browsers_[browser_id] = browser;
-      ListValue* page_list = new ListValue();
-      browser_data->Set(kAdbPagesField, page_list);
-
-      DevToolsTargetImpl::List pages = browser->CreatePageTargets();
-      for (DevToolsTargetImpl::List::iterator it =
-          pages.begin(); it != pages.end(); ++it) {
-        DevToolsTargetImpl* page =  *it;
-        DictionaryValue* page_data = BuildTargetDescriptor(*page);
-        page_data->SetBoolean(
-            kAdbAttachedForeignField,
-            page->IsAttached() &&
-                !DevToolsAdbBridge::HasDevToolsWindow(page->GetId()));
-        // Pass the screen size in the page object to make sure that
-        // the caching logic does not prevent the page item from updating
-        // when the screen size changes.
-        gfx::Size screen_size = device->screen_size();
-        page_data->SetInteger(kAdbScreenWidthField, screen_size.width());
-        page_data->SetInteger(kAdbScreenHeightField, screen_size.height());
-        remote_targets_[page->GetId()] = page;
-        page_list->Append(page_data);
-      }
-      browser_list->Append(browser_data);
-    }
-
-    ListValue* package_list = new ListValue();
-    device_data->Set(kAdbPackagesField, package_list);
-
-    DevToolsAdbBridge::RemotePackages& packages = device->packages();
-    for (DevToolsAdbBridge::RemotePackages::iterator pit = packages.begin();
-        pit != packages.end(); ++pit) {
-      DevToolsAdbBridge::RemotePackage* package = pit->get();
-      DictionaryValue* package_data = new DictionaryValue();
-      package_data->SetString(kAdbBrowserNameField, package->display_name());
-      std::string package_id = base::StringPrintf(
-          "package:%s:%s",
-          device->GetSerial().c_str(), // Ensure uniqueness across devices.
-          package->package_name().c_str()); // Ensure uniqueness on the device.
-      package_data->SetString(kAdbGlobalIdField, package_id);
-      remote_packages_[package_id] = package;
-      package_list->Append(package_data);
-    }
-
-    if (port_forwarding_controller) {
-      PortForwardingController::DevicesStatus::iterator sit =
-          port_forwarding_status.find(device->GetSerial());
-      if (sit != port_forwarding_status.end()) {
-        DictionaryValue* port_status_dict = new DictionaryValue();
-        typedef PortForwardingController::PortStatusMap StatusMap;
-        const StatusMap& port_status = sit->second;
-        for (StatusMap::const_iterator it = port_status.begin();
-             it != port_status.end(); ++it) {
-          port_status_dict->SetInteger(
-              base::StringPrintf("%d", it->first), it->second);
-        }
-        device_data->Set(kAdbPortStatus, port_status_dict);
-      }
-    }
-
-    device_list.Append(device_data);
-  }
-  web_ui()->CallJavascriptFunction("populateRemoteTargets", device_list);
-}
-
 void InspectUI::UpdateDiscoverUsbDevicesEnabled() {
   const Value* value = GetPrefValue(prefs::kDevToolsDiscoverUsbDevicesEnabled);
   web_ui()->CallJavascriptFunction("updateDiscoverUsbDevicesEnabled", *value);
@@ -755,3 +394,38 @@ const base::Value* InspectUI::GetPrefValue(const char* name) {
   Profile* profile = Profile::FromWebUI(web_ui());
   return profile->GetPrefs()->FindPreference(name)->GetValue();
 }
+
+void InspectUI::AddTargetUIHandler(
+    scoped_ptr<DevToolsTargetsUIHandler> handler) {
+  DevToolsTargetsUIHandler* handler_ptr = handler.release();
+  target_handlers_[handler_ptr->source_id()] = handler_ptr;
+}
+
+void InspectUI::AddRemoteTargetUIHandler(
+    scoped_ptr<DevToolsRemoteTargetsUIHandler> handler) {
+  DevToolsRemoteTargetsUIHandler* handler_ptr = handler.release();
+  remote_target_handlers_[handler_ptr->source_id()] = handler_ptr;
+}
+
+DevToolsTargetsUIHandler* InspectUI::FindTargetHandler(
+    const std::string& source_id) {
+  TargetHandlerMap::iterator it = target_handlers_.find(source_id);
+  return it != target_handlers_.end() ?
+         it->second :
+         FindRemoteTargetHandler(source_id);
+}
+
+DevToolsRemoteTargetsUIHandler* InspectUI::FindRemoteTargetHandler(
+    const std::string& source_id) {
+  RemoteTargetHandlerMap::iterator it = remote_target_handlers_.find(source_id);
+  return it != remote_target_handlers_.end() ? it->second : NULL;
+}
+
+void InspectUI::PopulateTargets(const std::string& source,
+                                scoped_ptr<base::ListValue> targets) {
+  scoped_ptr<base::Value> source_value(base::Value::CreateStringValue(source));
+  web_ui()->CallJavascriptFunction(
+      "populateTargets",
+      *source_value.get(),
+      *targets.get());
+}