Allow task pools to reason about transparency.

cc/raster/zero_copy_tile_task_worker_pool.h

 // Copyright 2013 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_RASTER_ZERO_COPY_TILE_TASK_WORKER_POOL_H_
 #define CC_RASTER_ZERO_COPY_TILE_TASK_WORKER_POOL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "cc/raster/tile_task_runner.h"
@@ skipping 10 matching lines @@
 
 class CC_EXPORT ZeroCopyTileTaskWorkerPool : public TileTaskWorkerPool,
                                              public TileTaskRunner,
                                              public TileTaskClient {
  public:
   ~ZeroCopyTileTaskWorkerPool() override;
 
   static scoped_ptr<TileTaskWorkerPool> Create(
       base::SequencedTaskRunner* task_runner,
       TaskGraphRunner* task_graph_runner,
-      ResourceProvider* resource_provider);
+      ResourceProvider* resource_provider,
+      bool use_rgba_4444_texture_format);
 
   // Overridden from TileTaskWorkerPool:
   TileTaskRunner* AsTileTaskRunner() override;
 
   // Overridden from TileTaskRunner:
   void SetClient(TileTaskRunnerClient* client) override;
   void Shutdown() override;
   void ScheduleTasks(TileTaskQueue* queue) override;
   void CheckForCompletedTasks() override;
-  ResourceFormat GetResourceFormat() const override;
-  bool GetResourceRequiresSwizzle() const override;
+  ResourceFormat GetResourceFormat(bool must_support_alpha) const override;
+  bool GetResourceRequiresSwizzle(bool must_support_alpha) const override;
 
   // Overridden from TileTaskClient:
   scoped_ptr<RasterBuffer> AcquireBufferForRaster(
       const Resource* resource,
       uint64_t resource_content_id,
       uint64_t previous_content_id) override;
   void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
 
  protected:
   ZeroCopyTileTaskWorkerPool(base::SequencedTaskRunner* task_runner,
                              TaskGraphRunner* task_graph_runner,
-                             ResourceProvider* resource_provider);
+                             ResourceProvider* resource_provider,
+                             bool use_rgba_4444_texture_format);
 
  private:
   void OnTaskSetFinished(TaskSet task_set);
   scoped_refptr<base::trace_event::ConvertableToTraceFormat> StateAsValue()
       const;
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   TaskGraphRunner* task_graph_runner_;
   const NamespaceToken namespace_token_;
   TileTaskRunnerClient* client_;
   ResourceProvider* resource_provider_;
 
+  bool use_rgba_4444_texture_format_;
+
   TaskSetCollection tasks_pending_;
 
   scoped_refptr<TileTask> task_set_finished_tasks_[kNumberOfTaskSets];
 
   // Task graph used when scheduling tasks and vector used to gather
   // completed tasks.
   TaskGraph graph_;
   Task::Vector completed_tasks_;
 
   base::WeakPtrFactory<ZeroCopyTileTaskWorkerPool>
       task_set_finished_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ZeroCopyTileTaskWorkerPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_ZERO_COPY_TILE_TASK_WORKER_POOL_H_