Don't spam the GPU process with memory usage stats

cc/layer_tree_host_impl.h

Index: cc/layer_tree_host_impl.h
diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index 891d3e1162836e75c13aa77052ff42d95d173263..ff61b75249a82c527715cb28ea4748574b3a4eb5 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -255,6 +255,11 @@ public:
 
     void updateRootScrollLayerImplTransform();
 
+    void sendManagedMemoryStats(
+       size_t memoryVisibleBytes,
+       size_t memoryVisibleAndNearbyBytes,
+       size_t memoryUseBytes);
+
     FrameRateCounter* fpsCounter() const { return m_fpsCounter.get(); }
     DebugRectHistory* debugRectHistory() const { return m_debugRectHistory.get(); }
     ResourceProvider* resourceProvider() const { return m_resourceProvider.get(); }
@@ -395,6 +400,10 @@ private:
     AnimationControllerSet m_allAnimationControllers;
 #endif
 
+    size_t m_lastSentMemoryVisibleBytes;
+    size_t m_lastSentMemoryVisibleAndNearbyBytes;
+    size_t m_lastSentMemoryUseBytes;
+
     DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };