<webview>: Support zoom in WebUI

content/browser/browser_plugin/browser_plugin_embedder.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.
 
 // A BrowserPluginEmbedder handles messages coming from a BrowserPlugin's
 // embedder that are not directed at any particular existing guest process.
 // In the beginning, when a BrowserPlugin instance in the embedder renderer
 // process requests an initial navigation, the WebContents for that renderer
 // renderer creates a BrowserPluginEmbedder for itself. The
 // BrowserPluginEmbedder, in turn, forwards the requests to a
@@ skipping 49 matching lines @@
   // Currently we are only interested in checking for the escape key to
   // unlock hte guest's pointer lock.
   bool HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
 
   // Overrides factory for testing. Default (NULL) value indicates regular
   // (non-test) environment.
   static void set_factory_for_testing(BrowserPluginHostFactory* factory) {
     factory_ = factory;
   }
 
+  // Sets the zoom level for all guests within this embedder.
+  void SetZoomLevel(double level);
+
   // WebContentsObserver implementation.
   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   void DragSourceEndedAt(int client_x, int client_y, int screen_x,
       int screen_y, blink::WebDragOperation operation);
 
   void DragSourceMovedTo(int client_x, int client_y,
                          int screen_x, int screen_y);
 
@@ skipping 13 matching lines @@
   friend class TestBrowserPluginEmbedder;
 
   BrowserPluginEmbedder(WebContentsImpl* web_contents);
 
   void CleanUp();
 
   BrowserPluginGuestManager* GetBrowserPluginGuestManager();
 
   bool DidSendScreenRectsCallback(BrowserPluginGuest* guest);
 
+  bool SetZoomLevelCallback(double level, BrowserPluginGuest* guest);
+
   bool UnlockMouseIfNecessaryCallback(const NativeWebKeyboardEvent& event,
                                       BrowserPluginGuest* guest);
 
   // Message handlers.
 
   void OnAllocateInstanceID(int request_id);
   void OnAttach(int instance_id,
                 const BrowserPluginHostMsg_Attach_Params& params,
                 const base::DictionaryValue& extra_params);
   void OnPluginAtPositionResponse(int instance_id,
@@ skipping 22 matching lines @@
   // Pointer to the guest that started the drag, used to forward necessary drag
   // status messages to the correct guest.
   base::WeakPtr<BrowserPluginGuest> guest_started_drag_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginEmbedder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_