cc: Rasterize cheap tiles immediately

cc/layer_tree_host_impl.h

 // Copyright 2011 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 CC_LAYER_TREE_HOST_IMPL_H_
 #define CC_LAYER_TREE_HOST_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
@@ skipping 120 matching lines @@
     virtual void setFullRootLayerDamage() OVERRIDE;
     virtual void setManagedMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE;
     virtual void enforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE;
     virtual bool hasImplThread() const OVERRIDE;
     virtual bool shouldClearRootRenderPass() const OVERRIDE;
     virtual CompositorFrameMetadata makeCompositorFrameMetadata() const OVERRIDE;
 
     // TileManagerClient implementation.
     virtual void ScheduleManageTiles() OVERRIDE;
     virtual void DidUploadVisibleHighResolutionTile() OVERRIDE;
+    virtual bool CanDoAnotherCheapRaster() const OVERRIDE;
+    virtual void DidPerformCheapRaster() OVERRIDE;
 
     // OutputSurfaceClient implementation.
     virtual void OnVSyncParametersChanged(base::TimeTicks timebase, base::TimeDelta interval) OVERRIDE;
     virtual void OnSendFrameToParentCompositorAck(const CompositorFrameAck&) OVERRIDE;
 
     // Called from LayerTreeImpl.
     void OnCanDrawStateChangedForTree(LayerTreeImpl*);
 
     // Implementation
     bool canDraw();
@@ skipping 211 matching lines @@
     int64 m_cumulativeNumMissingTiles;
 
     size_t m_lastSentMemoryVisibleBytes;
     size_t m_lastSentMemoryVisibleAndNearbyBytes;
     size_t m_lastSentMemoryUseBytes;
 
     base::TimeTicks m_currentFrameTime;
 
     scoped_ptr<AnimationRegistrar> m_animationRegistrar;
 
+    int m_cheapRasterCount;
+    mutable base::TimeTicks m_cheapRasterDeadline;
+
     DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYER_TREE_HOST_IMPL_H_