cc: Make images that can't possibly fit in cache not checker.

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 821 matching lines @@
 void SoftwareImageDecodeCache::ReduceCacheUsage() {
   base::AutoLock lock(lock_);
   ReduceCacheUsageUntilWithinLimit(max_items_in_cache_);
 }
 
 void SoftwareImageDecodeCache::ClearCache() {
   base::AutoLock lock(lock_);
   ReduceCacheUsageUntilWithinLimit(0);
 }
 
+size_t SoftwareImageDecodeCache::GetMaximumMemoryLimit() const {
+  return locked_images_budget_.total_limit_bytes();
+}
+
 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 321 matching lines @@
     }
   }
 }
 
 void SoftwareImageDecodeCache::OnPurgeMemory() {
   base::AutoLock lock(lock_);
   ReduceCacheUsageUntilWithinLimit(0);
 }
 
 }  // namespace cc