move favicon download code from chrome/ into content/

content/public/browser/web_contents_observer.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/process_util.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/common/page_transition_types.h"
 #include "content/public/common/three_d_api_types.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "webkit/glue/window_open_disposition.h"
 
 namespace content {
 
 class RenderViewHost;
 class WebContents;
 class WebContentsImpl;
+struct FaviconURL;
 struct FrameNavigateParams;
 struct LoadCommittedDetails;
 struct Referrer;
 
 // An observer API implemented by classes which are interested in various page
 // load events from WebContents.  They also get a chance to filter IPC messages.
 class CONTENT_EXPORT WebContentsObserver : public IPC::Listener,
                                            public IPC::Sender {
  public:
   // Only one of the two methods below will be called when a RVH is created for
@@ skipping 103 matching lines @@
 
   // Called when the user agent override for a WebContents has been changed.
   virtual void UserAgentOverrideSet(const std::string& user_agent) {}
 
   // Indicates that client 3D APIs (Pepper 3D, WebGL) were just
   // blocked on the current page, specifically because the GPU was
   // reset recently.
   virtual void DidBlock3DAPIs(const GURL& url,
                               ThreeDAPIType requester) {}
 
+  // Invoked when new FaviconURL candidates are received from the renderer.
+  virtual void DidUpdateFaviconURL(int32 page_id,
+                                   const std::vector<FaviconURL>& candidates) {}
+
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC::Sender implementation.
   virtual bool Send(IPC::Message* message) OVERRIDE;
   int routing_id() const;
 
  protected:
   // Use this constructor when the object is tied to a single WebContents for
   // its entire lifetime.
@@ skipping 19 matching lines @@
   void WebContentsImplDestroyed();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_