Do FinishAllRendering in WM_WINDOWPOSCHANGING

ui/compositor/compositor.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 UI_COMPOSITOR_COMPOSITOR_H_
 #define UI_COMPOSITOR_COMPOSITOR_H_
 
 #include <string>
 
 #include "base/containers/hash_tables.h"
@@ skipping 155 matching lines @@
 
   // Where possible, draws are scissored to a damage region calculated from
   // changes to layer properties.  This bypasses that and indicates that
   // the whole frame needs to be drawn.
   void ScheduleFullRedraw();
 
   // Schedule redraw and append damage_rect to the damage region calculated
   // from changes to layer properties.
   void ScheduleRedrawRect(const gfx::Rect& damage_rect);
 
+  // Finishes all outstanding rendering on the GPU.
+  void FinishAllRendering();
+
   void SetLatencyInfo(const LatencyInfo& latency_info);
 
   // Sets the compositor's device scale factor and size.
   void SetScaleAndSize(float scale, const gfx::Size& size_in_pixel);
 
   // Returns the size of the widget that is being drawn to in pixel coordinates.
   const gfx::Size& size() const { return size_; }
 
   // Sets the background color used for areas that aren't covered by
   // the |root_layer|.
@@ skipping 83 matching lines @@
   // The manager of vsync parameters for this compositor.
   scoped_refptr<CompositorVSyncManager> vsync_manager_;
 
   // The device scale factor of the monitor that this compositor is compositing
   // layers on.
   float device_scale_factor_;
 
   int last_started_frame_;
   int last_ended_frame_;
 
-  bool next_draw_is_resize_;
-
   bool disable_schedule_composite_;
 
   CompositorLock* compositor_lock_;
 
   // Prevent more than one draw from being scheduled.
   bool defer_draw_scheduling_;
 
   // Used to prevent Draw()s while a composite is in progress.
   bool waiting_on_compositing_end_;
   bool draw_on_compositing_end_;
   enum SwapState { SWAP_NONE, SWAP_POSTED, SWAP_COMPLETED };
   SwapState swap_state_;
 
   base::WeakPtrFactory<Compositor> schedule_draw_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_