Implement OnMemoryStateChange for Various CC Classes

cc/tiles/gpu_image_decode_controller.h

 // 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.
 
 #ifndef CC_TILES_GPU_IMAGE_DECODE_CONTROLLER_H_
 #define CC_TILES_GPU_IMAGE_DECODE_CONTROLLER_H_
 
 #include <memory>
 #include <unordered_map>
 #include <vector>
@@ skipping 302 matching lines @@
   // |persistent_cache_| represents the long-lived cache, keeping a certain
   // budget of ImageDatas alive even when their ref count reaches zero.
   using PersistentCache = base::MRUCache<uint32_t, scoped_refptr<ImageData>>;
   PersistentCache persistent_cache_;
 
   // |in_use_cache_| represents the in-use (short-lived) cache. Entries are
   // cleaned up as soon as their ref count reaches zero.
   using InUseCache = std::unordered_map<InUseCacheKey, InUseCacheEntry>;
   InUseCache in_use_cache_;
 
-  size_t cached_items_limit_;
-  size_t cached_bytes_limit_;
-  size_t bytes_used_;
   const size_t max_gpu_image_bytes_;
+  size_t cached_bytes_limit_ = max_gpu_image_bytes_;
+  size_t bytes_used_ = 0;
+  base::MemoryState memory_state_ = base::MemoryState::NORMAL;
 
   // We can't release GPU backed SkImages without holding the context lock,
   // so we add them to this list and defer deletion until the next time the lock
   // is held.
   std::vector<sk_sp<SkImage>> images_pending_deletion_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_GPU_IMAGE_DECODE_CONTROLLER_H_