cc: Merge TileTaskRunner to TileTaskWorkerPool.

cc/raster/tile_task.h

Index: cc/raster/tile_task.h
diff --git a/cc/raster/tile_task.h b/cc/raster/tile_task.h
new file mode 100644
index 0000000000000000000000000000000000000000..7b0f84e44dd558617987feb7cb3d388e134e830e
--- /dev/null
+++ b/cc/raster/tile_task.h
@@ -0,0 +1,52 @@
+// Copyright 2014 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_TILE_TASK_H_
+#define CC_RASTER_TILE_TASK_H_
+
+#include <vector>
+
+#include "cc/raster/task.h"
+
+namespace cc {
+class RasterBufferProvider;
+
+class CC_EXPORT TileTask : public Task {
+ public:
+  typedef std::vector<scoped_refptr<TileTask>> Vector;
+
+  const TileTask::Vector& dependencies() const { return dependencies_; }
+
+  // Indicates whether this TileTask can be run at the same time as other tasks
+  // in the task graph. If false, this task will be scheduled with
+  // TASK_CATEGORY_NONCONCURRENT_FOREGROUND.
+  bool supports_concurrent_execution() const {
+    return supports_concurrent_execution_;
+  }
+
+  virtual void ScheduleOnOriginThread(RasterBufferProvider* provider) = 0;
+  virtual void CompleteOnOriginThread(RasterBufferProvider* provider) = 0;
+
+  void WillSchedule();
+  void DidSchedule();
+  bool HasBeenScheduled() const;
+
+  void WillComplete();
+  void DidComplete();
+  bool HasCompleted() const;
+
+ protected:
+  explicit TileTask(bool supports_concurrent_execution);
+  TileTask(bool supports_concurrent_execution, TileTask::Vector* dependencies);
+  ~TileTask() override;
+
+  const bool supports_concurrent_execution_;
+  TileTask::Vector dependencies_;
+  bool did_schedule_;
+  bool did_complete_;
+};
+
+}  // namespace cc
+
+#endif  // CC_RASTER_TILE_TASK_H_