cc: Check for completed raster tasks at interval.

cc/layer_tree_host_impl_unittest.cc

Index: cc/layer_tree_host_impl_unittest.cc
diff --git a/cc/layer_tree_host_impl_unittest.cc b/cc/layer_tree_host_impl_unittest.cc
index 2c6eefcc7e200e6acbf90fd540d189203172dc65..c7e52dd63a31651a1dc30bb6f5f4aca7ca3e2d92 100644
--- a/cc/layer_tree_host_impl_unittest.cc
+++ b/cc/layer_tree_host_impl_unittest.cc
@@ -68,6 +68,7 @@ public:
         , m_didRequestCommit(false)
         , m_didRequestRedraw(false)
         , m_didUploadVisibleHighResolutionTile(false)
+        , m_didDetectIdleRaster(false)
         , m_reduceMemoryResult(true)
     {
         media::InitializeMediaLibraryForTesting();
@@ -95,8 +96,10 @@ public:
     virtual void onHasPendingTreeStateChanged(bool hasPendingTree) OVERRIDE { m_hasPendingTree = hasPendingTree; }
     virtual void setNeedsRedrawOnImplThread() OVERRIDE { m_didRequestRedraw = true; }
     virtual void didUploadVisibleHighResolutionTileOnImplThread() OVERRIDE { m_didUploadVisibleHighResolutionTile = true; }
+    virtual void didDetectIdleRasterOnImplThread() OVERRIDE { m_didDetectIdleRaster = true; }
     virtual void setNeedsCommitOnImplThread() OVERRIDE { m_didRequestCommit = true; }
     virtual void setNeedsManageTilesOnImplThread() OVERRIDE { }
+    virtual void setNeedsCheckForCompletedRasterTasksOnImplThread() OVERRIDE { }
     virtual void postAnimationEventsToMainThreadOnImplThread(scoped_ptr<AnimationEventsVector>, base::Time wallClockTime) OVERRIDE { }
     virtual bool reduceContentsTextureMemoryOnImplThread(size_t limitBytes, int priorityCutoff) OVERRIDE { return m_reduceMemoryResult; }
     virtual void reduceWastedContentsTextureMemoryOnImplThread() OVERRIDE { }
@@ -229,6 +232,7 @@ protected:
     bool m_didRequestCommit;
     bool m_didRequestRedraw;
     bool m_didUploadVisibleHighResolutionTile;
+    bool m_didDetectIdleRaster;
     bool m_reduceMemoryResult;
 };