User Gesture plumbed from Renderer to Browser's FullscreenController::RequestToLockMouse.

content/public/browser/render_view_host_delegate.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_RENDER_VIEW_HOST_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_DELEGATE_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 381 matching lines @@
 
   // The contents' preferred size changed.
   virtual void UpdatePreferredSize(const gfx::Size& pref_size) {}
 
   // The contents auto-resized and the container should match it.
   virtual void ResizeDueToAutoResize(const gfx::Size& new_size) {}
 
   // Requests to lock the mouse. Once the request is approved or rejected,
   // GotResponseToLockMouseRequest() will be called on the requesting render
   // view host.
-  virtual void RequestToLockMouse() {}
+  virtual void RequestToLockMouse(bool user_gesture) {}
 
   // Notification that the view has lost the mouse lock.
   virtual void LostMouseLock() {}
 
  protected:
   virtual ~RenderViewHostDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_DELEGATE_H_