Clear Image Decode Cache on Navigation

cc/tiles/image_controller_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/tiles/image_controller.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/optional.h"
@@ skipping 110 matching lines @@
     --number_of_refs_;
   }
   DecodedDrawImage GetDecodedImageForDraw(const DrawImage& image) override {
     return DecodedDrawImage(nullptr, kNone_SkFilterQuality);
   }
   void DrawWithImageFinished(const DrawImage& image,
                              const DecodedDrawImage& decoded_image) override {}
   void ReduceCacheUsage() override {}
   void SetShouldAggressivelyFreeResources(
       bool aggressively_free_resources) override {}
+  void ClearCache() override {}
 
   int number_of_refs() const { return number_of_refs_; }
   void SetTaskToUse(scoped_refptr<TileTask> task) { task_to_use_ = task; }
 
  private:
   int number_of_refs_ = 0;
   scoped_refptr<TileTask> task_to_use_;
 };
 
 // A simple class that can receive decode callbacks.
@@ skipping 445 matching lines @@
             decode_client2.result());
 
   // Reset the controller since the order of destruction is wrong in this test
   // (|other_cache| should outlive the controller. This is normally done via
   // SetImageDecodeCache(nullptr) or it can be done in the dtor of the cache.)
   ResetController();
 }
 
 }  // namespace
 }  // namespace cc