<webview>: Implement WebRequest API

chrome/browser/webview/webview_guest.cc

+// Copyright (c) 2013 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 "chrome/browser/webview/webview_guest.h"
+
+#include "base/lazy_instance.h"
+#include "chrome/browser/extensions/api/web_request/web_request_api.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/site_instance.h"
+#include "content/public/browser/web_contents.h"
+
+using content::WebContents;
+
+namespace chrome {
+
+namespace {
+
+typedef std::map<int, WebViewGuest*> WebViewGuestMap;
+typedef std::map<void*, WebViewGuestMap> WebViewProfileMap;
+static base::LazyInstance<WebViewProfileMap> g_webview_profile_map =
+    LAZY_INSTANCE_INITIALIZER;
+
+void RemoveWebViewEventListenersOnIOThread(
+    void* profile,
+    const std::string& extension_id,
+    int embedder_process_id,
+    int web_view_instance_id) {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  ExtensionWebRequestEventRouter::GetInstance()->RemoveWebViewEventListeners(
+      profile, extension_id, embedder_process_id, web_view_instance_id);
+}
+
+}  // namespace
+
+WebViewGuest::WebViewGuest(WebContents* guest_web_contents,
+                           WebContents* embedder_web_contents,
+                           const std::string& extension_id)
+    : WebContentsObserver(guest_web_contents),
+      embedder_web_contents_(embedder_web_contents),
+      extension_id_(extension_id) {
+  profile_ = guest_web_contents->GetBrowserContext();
+  instance_id_ = guest_web_contents->GetEmbeddedInstanceID();
+  // We cache the embedder's process ID and routing ID here as the embedder
+  // may be destroyed prior to the destruction of the guest.
+  embedder_render_process_id_ =
+      embedder_web_contents->GetRenderProcessHost()->GetID();
+  g_webview_profile_map.Get()[profile_].insert(
+      std::make_pair(instance_id_, this));
+}
+
+WebViewGuest::~WebViewGuest() {
+  g_webview_profile_map.Get()[profile_].erase(instance_id_);
+  if (!g_webview_profile_map.Get()[profile_].size())
+    g_webview_profile_map.Get().erase(profile_);
+}
+
+// static
+WebViewGuest* WebViewGuest::From(void* profile, int instance_id) {
+  WebViewProfileMap* profile_map = g_webview_profile_map.Pointer();
+  WebViewProfileMap::iterator it = profile_map->find(profile);
+  if (it == profile_map->end())
+    return NULL;
+  const WebViewGuestMap& guest_map = it->second;
+  WebViewGuestMap::const_iterator guest_it = guest_map.find(instance_id);
+  return guest_it == guest_map.end() ? NULL : guest_it->second;
+}
+
+void WebViewGuest::WebContentsDestroyed(WebContents* web_contents) {
+  content::BrowserThread::PostTask(
+      content::BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(
+          &RemoveWebViewEventListenersOnIOThread,
+          profile_, extension_id_,
+          embedder_render_process_id_,
+          instance_id_));
+  delete this;
+}
+
+}  // namespace chrome