cc: Implement test task runner for tests.

cc/test/test_tile_task_runner.h

Index: cc/test/test_tile_task_runner.h
diff --git a/cc/test/test_tile_task_runner.h b/cc/test/test_tile_task_runner.h
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index 0000000000000000000000000000000000000000..ca798dbb966e5e88b484c61657a6df86416006dd
--- /dev/null
+++ b/cc/test/test_tile_task_runner.h
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+// Copyright 2016 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_TEST_TEST_TILE_TASK_RUNNER_H_
+#define CC_TEST_TEST_TILE_TASK_RUNNER_H_
+
+#include "cc/raster/tile_task.h"
+
+namespace cc {
+
+// This task runner operates on single task. User has to call respective
+// functions to operate on task.
+class TestTileTaskRunner {
+ public:
+  // Schedules, runs and completes the task.
+  static void ProcessTask(TileTask* task);
+
+  static void ScheduleTask(TileTask* task);
+  static void CancelTask(TileTask* task);
+
+  // Before running the task it must be scheduled. Call ScheduleTask() before
+  // calling this function. This starts, runs and finishes the task.
+  static void RunTask(TileTask* task);
+
+  // Before completing the task it must be canceled or finished by running. Call
+  // RunTask() or CancelTask before calling this function.
+  static void CompleteTask(TileTask* task);
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_TEST_TILE_TASK_RUNNER_H_