Update from https://crrev.com/307664

cc/resources/zero_copy_tile_task_worker_pool.h

Index: cc/resources/zero_copy_tile_task_worker_pool.h
diff --git a/cc/resources/zero_copy_tile_task_worker_pool.h b/cc/resources/zero_copy_tile_task_worker_pool.h
new file mode 100644
index 0000000000000000000000000000000000000000..9cc5ee993fb142a016f3541f4c1a28faa83accdb
--- /dev/null
+++ b/cc/resources/zero_copy_tile_task_worker_pool.h
@@ -0,0 +1,79 @@
+// 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_RESOURCES_ZERO_COPY_TILE_TASK_WORKER_POOL_H_
+#define CC_RESOURCES_ZERO_COPY_TILE_TASK_WORKER_POOL_H_
+
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "cc/resources/tile_task_runner.h"
+#include "cc/resources/tile_task_worker_pool.h"
+
+namespace base {
+namespace debug {
+class ConvertableToTraceFormat;
+}
+}
+
+namespace cc {
+class ResourceProvider;
+
+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);
+
+  // 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;
+
+  // Overridden from TileTaskClient:
+  scoped_ptr<RasterBuffer> AcquireBufferForRaster(
+      const Resource* resource) override;
+  void ReleaseBufferForRaster(scoped_ptr<RasterBuffer> buffer) override;
+
+ protected:
+  ZeroCopyTileTaskWorkerPool(base::SequencedTaskRunner* task_runner,
+                             TaskGraphRunner* task_graph_runner,
+                             ResourceProvider* resource_provider);
+
+ private:
+  void OnTaskSetFinished(TaskSet task_set);
+  scoped_refptr<base::debug::ConvertableToTraceFormat> StateAsValue() const;
+
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+  TaskGraphRunner* task_graph_runner_;
+  const NamespaceToken namespace_token_;
+  TileTaskRunnerClient* client_;
+  ResourceProvider* resource_provider_;
+
+  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_RESOURCES_ZERO_COPY_TILE_TASK_WORKER_POOL_H_