Drop frontbuffers with ui-use-gpu-process, synchronized with browser, decoupled from backbuffer dro…

content/browser/renderer_host/render_widget_host_impl.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 134 matching lines @@
   // IPC::Channel::Listener
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
 
   // Sends a message to the corresponding object in the renderer.
   virtual bool Send(IPC::Message* msg) OVERRIDE;
 
   // Called to notify the RenderWidget that it has been hidden or restored from
   // having been hidden.
   void WasHidden();
   void WasRestored();
+  bool IsVisible() const { return !is_hidden_; }
 
   // Called to notify the RenderWidget that its associated native window got
   // focused.
   virtual void GotFocus();
 
   // Tells the renderer it got/lost focus.
   void Focus();
   virtual void LostCapture();
 
   // Sets whether the renderer should show controls in an active state.  On all
@@ skipping 184 matching lines @@
 
   // Called when the reponse to a pending mouse lock request has arrived.
   // Returns true if |allowed| is true and the mouse has been successfully
   // locked.
   bool GotResponseToLockMouseRequest(bool allowed);
 
   // Called by the view in response to AcceleratedSurfaceBuffersSwapped.
   static void AcknowledgeSwapBuffers(int32 route_id, int gpu_host_id);
   static void AcknowledgePostSubBuffer(int32 route_id, int gpu_host_id);
 
+#if defined(USE_AURA)
+  // Called by the view in response to visibility changes once the front surface
+  // is no longer in use by the ui (false), or when we expect to have a valid
+  // front surface for use by the ui (true).
+  static void SendFrontSurfaceIsProtected(bool is_protected,
+                                          uint32 protection_state_id,
+                                          int32 route_id,
+                                          int gpu_host_id);
+#endif
+
   // Signals that the compositing surface was updated, e.g. after a lost context
   // event.
   void CompositingSurfaceUpdated();
 
   void set_allow_privileged_mouse_lock(bool allow) {
     allow_privileged_mouse_lock_ = allow;
   }
 
  protected:
   virtual RenderWidgetHostImpl* AsRenderWidgetHostImpl() OVERRIDE;
@@ skipping 371 matching lines @@
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   scoped_ptr<TapSuppressionController> tap_suppression_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_