cc: Add new RasterWorkerPool interface.

cc/resources/image_raster_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_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_
+#define CC_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_
+
+#include "cc/resources/raster_worker_pool.h"
+
+namespace cc {
+
+class CC_EXPORT ImageRasterWorkerPool : public RasterWorkerPool,
+                                        public WorkerPoolClient {
+ public:
+  virtual ~ImageRasterWorkerPool();
+
+  static scoped_ptr<RasterWorkerPool> Create(
+      ResourceProvider* resource_provider, size_t num_threads) {
+    return make_scoped_ptr<RasterWorkerPool>(
+        new ImageRasterWorkerPool(resource_provider, num_threads));
+  }
+
+  // Overridden from RasterWorkerPool:
+  virtual void ScheduleTasks(RasterTask::Queue* queue) OVERRIDE;
+
+ private:
+  ImageRasterWorkerPool(ResourceProvider* resource_provider,
+                        size_t num_threads);
+
+  // Overridden from WorkerPoolClient:
+  virtual void DidFinishDispatchingWorkerPoolCompletionCallbacks() OVERRIDE {}
+
+  void OnRasterTaskCompleted(
+      scoped_refptr<internal::RasterWorkerPoolTask> task, bool was_canceled);
+  void DidFinishRasterTask(internal::RasterWorkerPoolTask* task);
+
+  TaskMap image_tasks_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImageRasterWorkerPool);
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_IMAGE_RASTER_WORKER_POOL_H_