Support frame tree propagation between renderers in the same browsing instance.

content/browser/renderer_host/render_view_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "base/json/json_reader.h"
+#include "base/json/json_writer.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/cross_site_request_manager.h"
 #include "content/browser/dom_storage/session_storage_namespace_impl.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
@@ skipping 911 matching lines @@
     IPC_MESSAGE_HANDLER(DesktopNotificationHostMsg_Cancel,
                         OnCancelDesktopNotification)
 #if defined(OS_MACOSX)
     IPC_MESSAGE_HANDLER(ViewHostMsg_ShowPopup, OnMsgShowPopup)
 #endif
     IPC_MESSAGE_HANDLER(ViewHostMsg_RunFileChooser, OnRunFileChooser)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DomOperationResponse,
                         OnDomOperationResponse)
     IPC_MESSAGE_HANDLER(AccessibilityHostMsg_Notifications,
                         OnAccessibilityNotifications)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_FrameTree, OnFrameTree)
     // Have the super handle all other messages.
     IPC_MESSAGE_UNHANDLED(
         handled = RenderWidgetHostImpl::OnMessageReceived(msg))
   IPC_END_MESSAGE_MAP_EX()
 
   if (!msg_is_ok) {
     // The message had a handler, but its de-serialization failed.
     // Kill the renderer.
     content::RecordAction(UserMetricsAction("BadMessageTerminate_RVH"));
     GetProcess()->ReceivedBadMessage();
@@ skipping 184 matching lines @@
   FilterURL(policy, renderer_id, true, &validated_params.referrer.url);
   for (std::vector<GURL>::iterator it(validated_params.redirects.begin());
       it != validated_params.redirects.end(); ++it) {
     FilterURL(policy, renderer_id, false, &(*it));
   }
   FilterURL(policy, renderer_id, true, &validated_params.searchable_form_url);
   FilterURL(policy, renderer_id, true, &validated_params.password_form.origin);
   FilterURL(policy, renderer_id, true, &validated_params.password_form.action);
 
   delegate_->DidNavigate(this, validated_params);
+
+  // For top level navigations, if there is no frame tree present for this
+  // instance (for example when the window is first created), then create
+  // an unnamed one with the proper frame id from the renderer.
+  // This should be done after we called DidNavigate, since updating the frame
+  // tree expects the render view being updated to be the active one.
+  if (content::PageTransitionIsMainFrame(validated_params.transition)) {
+    if (frame_tree_.empty()) {
+      base::DictionaryValue tree;
+      tree.SetString("name", std::string());
+      tree.SetInteger("id", validated_params.frame_id);
+      base::JSONWriter::Write(&tree, &frame_tree_);
+      delegate_->DidUpdateFrameTree(this);
+    }
+  }
 }
 
 void RenderViewHostImpl::OnMsgUpdateState(int32 page_id,
                                           const std::string& state) {
   delegate_->UpdateState(this, page_id, state);
 }
 
 void RenderViewHostImpl::OnMsgUpdateTitle(
     int32 page_id,
     const string16& title,
@@ skipping 466 matching lines @@
   RejectMouseLockOrUnlockIfNecessary();
   // We need to notify the contents that its fullscreen state has changed. This
   // is done as part of the resize message.
   WasResized();
 }
 
 webkit_glue::WebPreferences RenderViewHostImpl::GetWebkitPreferences() {
   return delegate_->GetWebkitPrefs();
 }
 
+const std::string& RenderViewHostImpl::GetFrameTree() {

[awong, 2012/08/20 21:56:31]

Should this method be const?

[nasko, 2012/08/21 00:34:45]

Done.

+  return frame_tree_;
+}
+
+void RenderViewHostImpl::UpdateFrameTree(
+    int process_id, int route_id, const std::string& frame_tree) {
+  frame_tree_ = frame_tree;
+
+  Send(new ViewMsg_FrameTree(GetRoutingID(),
+                             process_id,
+                             route_id,
+                             frame_tree_));
+}
+
 void RenderViewHostImpl::UpdateWebkitPreferences(
     const webkit_glue::WebPreferences& prefs) {
   Send(new ViewMsg_UpdateWebPreferences(GetRoutingID(), prefs));
 }
 
 void RenderViewHostImpl::ClearFocusedNode() {
   Send(new ViewMsg_ClearFocusedNode(GetRoutingID()));
 }
 
 void RenderViewHostImpl::SetZoomLevel(double level) {
@@ skipping 215 matching lines @@
 
 void RenderViewHostImpl::OnDomOperationResponse(
     const std::string& json_string, int automation_id) {
   DomOperationNotificationDetails details(json_string, automation_id);
   content::NotificationService::current()->Notify(
       content::NOTIFICATION_DOM_OPERATION_RESPONSE,
       content::Source<RenderViewHost>(this),
       content::Details<DomOperationNotificationDetails>(&details));
 }
 
+void RenderViewHostImpl::OnFrameTree(const std::string& frame_tree) {
+  frame_tree_ = frame_tree;
+  delegate_->DidUpdateFrameTree(this);
+}
+
 void RenderViewHostImpl::SetSwappedOut(bool is_swapped_out) {
   is_swapped_out_ = is_swapped_out;
 
   // Whenever we change swap out state, we should not be waiting for
   // beforeunload or unload acks.  We clear them here to be safe, since they
   // can cause navigations to be ignored in OnMsgNavigate.
   is_waiting_for_beforeunload_ack_ = false;
   is_waiting_for_unload_ack_ = false;
 }
 
 void RenderViewHostImpl::ClearPowerSaveBlockers() {
   STLDeleteValues(&power_save_blockers_);
 }
 
 }  // namespace content