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

cc/tiles/software_image_decode_cache.cc

 // Copyright 2015 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/software_image_decode_cache.h"
 
 #include <inttypes.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 838 matching lines @@
 
 void SoftwareImageDecodeCache::ClearCache() {
   base::AutoLock lock(lock_);
   ReduceCacheUsageUntilWithinLimit(0);
 }
 
 size_t SoftwareImageDecodeCache::GetMaximumMemoryLimitBytes() const {
   return locked_images_budget_.total_limit_bytes();
 }
 
+void SoftwareImageDecodeCache::NotifyImageUnused(uint32_t skimage_id) {
+  // TODO(sohanjg) :Implement it, crbug.com/734982.
+}
+
 void SoftwareImageDecodeCache::RemovePendingTask(const ImageKey& key,
                                                  DecodeTaskType task_type) {
   base::AutoLock lock(lock_);
   switch (task_type) {
     case DecodeTaskType::USE_IN_RASTER_TASKS:
       pending_in_raster_image_tasks_.erase(key);
       break;
     case DecodeTaskType::USE_OUT_OF_RASTER_TASKS:
       pending_out_of_raster_image_tasks_.erase(key);
       break;
@@ skipping 332 matching lines @@
     }
   }
 }
 
 void SoftwareImageDecodeCache::OnPurgeMemory() {
   base::AutoLock lock(lock_);
   ReduceCacheUsageUntilWithinLimit(0);
 }
 
 }  // namespace cc