cc: Interface to evict images from cc image decode cache.

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 8a9f4affdc3ed3649ca3224b40a871b5654a7576..5b6568da2253b462742a1909871770a6720574fd 100644
--- a/cc/raster/image_hijack_canvas_unittest.cc
+++ b/cc/raster/image_hijack_canvas_unittest.cc
@@ -33,6 +33,7 @@ class MockImageDecodeCache : public ImageDecodeCache {
   MOCK_METHOD2(GetOutOfRasterDecodeTaskForImageAndRef,
                bool(const DrawImage& image, scoped_refptr<TileTask>* task));
   MOCK_CONST_METHOD0(GetMaximumMemoryLimitBytes, size_t());
+  MOCK_METHOD1(NotifyImageUnused, void(uint32_t skimage_id));
 };
 
 TEST(ImageHijackCanvasTest, NonLazyImagesSkipped) {