Ensure Surface size always matches window size on swap

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index e45f215869b8c01f2783420d4926b29dc17208e7..57e4a8e28067ecb3804b06a5e30dcd765c73bea9 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -105,6 +105,10 @@ class COMPOSITOR_EXPORT ContextFactory {
 
   // Creates a Surface ID allocator with a new namespace.
   virtual scoped_ptr<cc::SurfaceIdAllocator> CreateSurfaceIdAllocator() = 0;
+
+  // Resize the display corresponding to this compositor to a particular size.
+  virtual void ResizeDisplay(ui::Compositor* compositor,
+                             const gfx::Size& size) = 0;
 };
 
 // This class represents a lock on the compositor, that can be used to prevent
@@ -183,8 +187,9 @@ class COMPOSITOR_EXPORT Compositor
   // from changes to layer properties.
   void ScheduleRedrawRect(const gfx::Rect& damage_rect);
 
-  // Finishes all outstanding rendering on the GPU.
-  void FinishAllRendering();
+  // Finishes all outstanding rendering and disables swapping on this surface
+  // until it is resized.
+  void DisableSwapUntilResize();
 
   void SetLatencyInfo(const LatencyInfo& latency_info);