cc: Unify context losing machinery

cc/single_thread_proxy.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_SINGLE_THREAD_PROXY_H_
 #define CC_SINGLE_THREAD_PROXY_H_
 
 #include <limits>
 
 #include "base/time.h"
@@ skipping 31 matching lines @@
     virtual void didAddAnimation() OVERRIDE;
     virtual void mainThreadHasStoppedFlinging() OVERRIDE { }
     virtual void start() OVERRIDE;
     virtual void stop() OVERRIDE;
     virtual size_t maxPartialTextureUpdates() const OVERRIDE;
     virtual void acquireLayerTextures() OVERRIDE { }
     virtual void forceSerializeOnSwapBuffers() OVERRIDE;
     virtual bool commitPendingForTesting() OVERRIDE;
 
     // LayerTreeHostImplClient implementation
-    virtual void didLoseOutputSurfaceOnImplThread() OVERRIDE { }
+    virtual void didLoseOutputSurfaceOnImplThread() OVERRIDE;
     virtual void onSwapBuffersCompleteOnImplThread() OVERRIDE;
     virtual void onVSyncParametersChanged(base::TimeTicks timebase, base::TimeDelta interval) OVERRIDE { }
     virtual void onCanDrawStateChanged(bool canDraw) OVERRIDE { }
     virtual void setNeedsRedrawOnImplThread() OVERRIDE;
     virtual void setNeedsCommitOnImplThread() OVERRIDE;
     virtual void setNeedsManageTilesOnImplThread() OVERRIDE;
     virtual void postAnimationEventsToMainThreadOnImplThread(scoped_ptr<AnimationEventsVector>, base::Time wallClockTime) OVERRIDE;
     virtual bool reduceContentsTextureMemoryOnImplThread(size_t limitBytes, int priorityCutoff) OVERRIDE;
     virtual void sendManagedMemoryStats() OVERRIDE;
 
@@ skipping 84 matching lines @@
     {
     }
 private:
     DebugScopedSetImplThread m_implThread;
     DebugScopedSetMainThreadBlocked m_mainThreadBlocked;
 };
 
 } // namespace cc
 
 #endif  // CC_SINGLE_THREAD_PROXY_H_