Forward input tasks to the Blink scheduler

cc/trees/main_thread_task_runner.h

Index: cc/trees/main_thread_task_runner.h
diff --git a/cc/trees/main_thread_task_runner.h b/cc/trees/main_thread_task_runner.h
new file mode 100644
index 0000000000000000000000000000000000000000..19416de493c96d22c33fcca7889404aeb167f7b4
--- /dev/null
+++ b/cc/trees/main_thread_task_runner.h
@@ -0,0 +1,48 @@
+// 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_TREES_MAIN_THREAD_TASK_RUNNER_H_
+#define CC_TREES_MAIN_THREAD_TASK_RUNNER_H_
+
+#include "base/single_thread_task_runner.h"
+#include "cc/base/cc_export.h"
+
+namespace cc {
+
+class CC_EXPORT MainThreadTaskRunner : public base::SingleThreadTaskRunner {
+ public:
+  virtual void PostBeginMainFrameTask(
+      const tracked_objects::Location& from_here, const base::Closure& task,
+      double frame_time, double deadline, double interval) = 0;
+
+  virtual bool PostDelayedTask(
+      const tracked_objects::Location& from_here, const base::Closure& task,
+      base::TimeDelta delay) OVERRIDE;
+
+  virtual bool PostNonNestableDelayedTask(
+      const tracked_objects::Location& from_here, const base::Closure& task,
+      base::TimeDelta delay) OVERRIDE;
+
+  virtual bool RunsTasksOnCurrentThread() const OVERRIDE;
+
+ protected:
+  virtual ~MainThreadTaskRunner() {}
+};
+
+class CC_EXPORT DefaultMainThreadTaskRunner : public MainThreadTaskRunner {
+ public:
+  virtual bool PostDelayedTask(
+      const tracked_objects::Location& from_here, const base::Closure& task,
+      base::TimeDelta delay) OVERRIDE;
+
+  virtual void PostBeginMainFrameTask(
+      const tracked_objects::Location& from_here, const base::Closure& task,
+      double frame_time, double deadline, double interval) OVERRIDE;
+ protected:
+  virtual ~DefaultMainThreadTaskRunner() {}
+};
+
+}  // namespace cc
+
+#endif  // CC_TREES_MAIN_THREAD_TASK_RUNNER_H_