Clear Image Decode Cache on Navigation

cc/raster/image_hijack_canvas_unittest.cc

Index: cc/raster/image_hijack_canvas_unittest.cc
diff --git a/cc/raster/image_hijack_canvas_unittest.cc b/cc/raster/image_hijack_canvas_unittest.cc
index 53caff0527132d482c0db9d0ab9608962ecefdb3..9f8f9fbafae62c4fb2a0ec09398397677484ed2d 100644
--- a/cc/raster/image_hijack_canvas_unittest.cc
+++ b/cc/raster/image_hijack_canvas_unittest.cc
@@ -29,6 +29,7 @@ class MockImageDecodeCache : public ImageDecodeCache {
   MOCK_METHOD0(ReduceCacheUsage, void());
   MOCK_METHOD1(SetShouldAggressivelyFreeResources,
                void(bool aggressively_free_resources));
+  MOCK_METHOD0(ClearCache, void());
   MOCK_METHOD2(GetOutOfRasterDecodeTaskForImageAndRef,
                bool(const DrawImage& image, scoped_refptr<TileTask>* task));
 };