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_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 137 matching lines @@
   // IPC::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 IsHidden() const { return is_hidden_; }
 
   // Returns true if the RenderWidget is hidden.
   bool is_hidden() 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();
@@ skipping 196 matching lines @@
       int32 route_id,
       int gpu_host_id,
       uint32 sync_point);
 
   // Called by the view in response to AcceleratedSurfaceBuffersSwapped for
   // platforms that support deferred GPU process descheduling. This does
   // nothing if the compositor thread is enabled.
   // TODO(jbates) Once the compositor thread is always on, this can be removed.
   void AcknowledgeSwapBuffersToRenderer();
 
+#if defined(USE_AURA)
+  // Called by the view in response to visibility changes:
+  // 1. After the front surface is guarenteed to no longer be in use by the ui
+  //    (protected false),
+  // 2. When the ui expects to have a valid front surface (protected 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 383 matching lines @@
   scoped_ptr<TapSuppressionController> tap_suppression_controller_;
 
   scoped_ptr<SmoothScrollGesture> active_smooth_scroll_gesture_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_