cc: Separate RasterWorkerPool interface from implementation details.

cc/resources/rasterizer_delegate.h

+// 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_RESOURCES_RASTERIZER_DELEGATE_H_
+#define CC_RESOURCES_RASTERIZER_DELEGATE_H_
+
+#include <vector>
+
+#include "cc/resources/rasterizer.h"
+
+namespace cc {
+
+class RasterizerDelegate : public RasterizerClient {
+ public:
+  virtual ~RasterizerDelegate();
+
+  static scoped_ptr<RasterizerDelegate> Create(RasterizerClient* client,
+                                               Rasterizer** rasterizers,
+                                               size_t num_rasterizers);
+
+  void SetClient(RasterizerClient* client);
+  void Shutdown();
+  void ScheduleTasks(RasterTaskQueue* queue);
+  void CheckForCompletedTasks();
+
+  // Overriden from RasterizerClient:
+  virtual bool ShouldForceTasksRequiredForActivationToComplete() const OVERRIDE;
+  virtual void DidFinishRunningTasks() OVERRIDE;
+  virtual void DidFinishRunningTasksRequiredForActivation() OVERRIDE;
+
+ private:
+  RasterizerDelegate(RasterizerClient* client,
+                     Rasterizer** rasterizers,
+                     size_t num_rasterizers);
+
+  RasterizerClient* client_;
+  typedef std::vector<Rasterizer*> RasterizerVector;
+  RasterizerVector rasterizers_;
+  size_t did_finish_running_tasks_pending_count_;
+  size_t did_finish_running_tasks_required_for_activation_pending_count_;
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_RASTERIZER_DELEGATE_H_