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 107 matching lines @@
   void DrawWithImageFinished(const DrawImage& image,
                              const DecodedDrawImage& decoded_image) override;
   void ReduceCacheUsage() override;
   void SetShouldAggressivelyFreeResources(
       bool aggressively_free_resources) override;
 
   // MemoryDumpProvider overrides.
   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
                     base::trace_event::ProcessMemoryDump* pmd) override;
 
+  // base::MemoryCoordinatorClient overrides.
+  void OnMemoryStateChange(base::MemoryState state) override;
+
   // Called by Decode / Upload tasks.
   void DecodeImage(const DrawImage& image);
   void UploadImage(const DrawImage& image);
 
   // Called by Decode / Upload tasks when tasks are finished.
   void OnImageDecodeTaskCompleted(const DrawImage& image);
   void OnImageUploadTaskCompleted(const DrawImage& image);
 
   // For testing only.
-  void SetCachedItemLimitForTesting(size_t limit) {
-    cached_items_limit_ = limit;
-  }
   void SetCachedBytesLimitForTesting(size_t limit) {
     cached_bytes_limit_ = limit;
   }
   size_t GetBytesUsedForTesting() const { return bytes_used_; }
+  size_t GetNumCacheEntriesForTesting() const {
+    return persistent_cache_.size();
+  }
   size_t GetDrawImageSizeForTesting(const DrawImage& image);
   void SetImageDecodingFailedForTesting(const DrawImage& image);
   bool DiscardableIsLockedForTesting(const DrawImage& image);
 
  private:
   enum class DecodedDataMode { GPU, CPU };
 
   // Stores the CPU-side decoded bits of an image and supporting fields.
   struct DecodedImageData {
     DecodedImageData();
@@ skipping 139 matching lines @@
   // Returns true if the given ImageData can be used to draw the specified
   // DrawImage.
   bool IsCompatible(const ImageData* image_data,
                     const DrawImage& draw_image) const;
 
   // The following two functions also require the |context_| lock to be held.
   void UploadImageIfNecessary(const DrawImage& draw_image,
                               ImageData* image_data);
   void DeletePendingImages();
 
-  // Overriden from base::MemoryCoordinatorClient.
-  void OnMemoryStateChange(base::MemoryState state) override;
-
   const ResourceFormat format_;
   ContextProvider* context_;
   sk_sp<GrContextThreadSafeProxy> context_threadsafe_proxy_;
 
   // All members below this point must only be accessed while holding |lock_|.
   base::Lock lock_;
 
   // |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_;
+  const size_t normal_max_gpu_image_bytes_;
+  size_t cached_bytes_limit_ = normal_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_