Clear Image Decode Cache on Navigation

cc/raster/image_hijack_canvas_unittest.cc

 // Copyright 2016 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.
 #include "cc/raster/image_hijack_canvas.h"
 
 #include "cc/test/skia_common.h"
 #include "cc/tiles/image_decode_cache.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 11 matching lines @@
                     scoped_refptr<TileTask>* task));
   MOCK_METHOD1(UnrefImage, void(const DrawImage& image));
   MOCK_METHOD1(GetDecodedImageForDraw,
                DecodedDrawImage(const DrawImage& image));
   MOCK_METHOD2(DrawWithImageFinished,
                void(const DrawImage& image,
                     const DecodedDrawImage& decoded_image));
   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));
 };
 
 TEST(ImageHijackCanvasTest, NonLazyImagesSkipped) {
   // Use a strict mock so that if *any* ImageDecodeCache methods are called, we
   // will hit an error.
   testing::StrictMock<MockImageDecodeCache> image_decode_cache;
   ImageIdFlatSet images_to_skip;
   ImageHijackCanvas canvas(100, 100, &image_decode_cache, &images_to_skip);
@@ skipping 36 matching lines @@
   canvas.drawImageRect(image, SkRect::MakeXYWH(0, 0, 10, 10),
                        SkRect::MakeXYWH(10, 10, 10, 10), &paint);
   paint.setShader(image->makeShader(SkShader::kClamp_TileMode,
                                     SkShader::kClamp_TileMode, nullptr));
   canvas.drawRect(SkRect::MakeXYWH(10, 10, 10, 10), paint);
 }
 
 }  // namespace
 
 }  // namespace cc