cc: Plumb gpu/sw image decode limits as layer tree settings.

cc/tiles/software_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_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_
 #define CC_TILES_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 85 matching lines @@
   }
 };
 
 class CC_EXPORT SoftwareImageDecodeController
     : public ImageDecodeController,
       public base::trace_event::MemoryDumpProvider {
  public:
   using ImageKey = ImageDecodeControllerKey;
   using ImageKeyHash = ImageDecodeControllerKeyHash;
 
-  explicit SoftwareImageDecodeController(ResourceFormat format);
-  SoftwareImageDecodeController();
+  SoftwareImageDecodeController(ResourceFormat format,
+                                size_t locked_memory_limit_bytes);
   ~SoftwareImageDecodeController() override;
 
   // ImageDecodeController overrides.
   bool GetTaskForImageAndRef(const DrawImage& image,
                              const TracingInfo& tracing_info,
                              scoped_refptr<TileTask>* task) override;
   void UnrefImage(const DrawImage& image) override;
   DecodedDrawImage GetDecodedImageForDraw(const DrawImage& image) override;
   void DrawWithImageFinished(const DrawImage& image,
                              const DecodedDrawImage& decoded_image) override;
@@ skipping 52 matching lines @@
   // MemoryBudget is a convenience class for memory bookkeeping and ensuring
   // that we don't go over the limit when pre-decoding.
   class MemoryBudget {
    public:
     explicit MemoryBudget(size_t limit_bytes);
 
     size_t AvailableMemoryBytes() const;
     void AddUsage(size_t usage);
     void SubtractUsage(size_t usage);
     void ResetUsage();
+    size_t total_limit_bytes() const { return limit_bytes_; }
 
    private:
     size_t GetCurrentUsageSafe() const;
 
     size_t limit_bytes_;
     base::CheckedNumeric<size_t> current_usage_bytes_;
   };
 
   using ImageMRUCache = base::HashingMRUCache<ImageKey,
                                               std::unique_ptr<DecodedImage>,
@@ skipping 66 matching lines @@
 
   ResourceFormat format_;
 
   // Used to uniquely identify DecodedImages for memory traces.
   base::AtomicSequenceNumber next_tracing_id_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_SOFTWARE_IMAGE_DECODE_CONTROLLER_H_