Update VideoFrameScheduler API and add clockless and testing implementations.

media/filters/test_video_frame_scheduler.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 MEDIA_FILTERS_TEST_VIDEO_FRAME_SCHEDULER_H_
+#define MEDIA_FILTERS_TEST_VIDEO_FRAME_SCHEDULER_H_
+
+#include <vector>
+
+#include "media/filters/video_frame_scheduler.h"
+
+namespace media {
+
+// A scheduler that queues frames until told otherwise.
+class TestVideoFrameScheduler : public VideoFrameScheduler {
+ public:
+  struct ScheduledFrame {
+    ScheduledFrame(const scoped_refptr<VideoFrame> frame,
+                   base::TimeTicks wall_ticks,
+                   const DoneCB& done_cb);
+    ~ScheduledFrame();
+
+    scoped_refptr<VideoFrame> frame;
+    base::TimeTicks wall_ticks;
+    DoneCB done_cb;
+  };
+
+  TestVideoFrameScheduler();
+  virtual ~TestVideoFrameScheduler();
+
+  // VideoFrameScheduler implementation.
+  virtual void ScheduleVideoFrame(const scoped_refptr<VideoFrame>& frame,
+                                  base::TimeTicks wall_ticks,
+                                  const DoneCB& done_cb) OVERRIDE;
+  virtual void Reset() OVERRIDE;
+
+  // Displays all frames with scheduled times <= |wall_ticks|.
+  void DisplayFramesUpTo(base::TimeTicks wall_ticks);
+
+  // Drops all frames with scheduled times <= |wall_ticks|.
+  void DropFramesUpTo(base::TimeTicks wall_ticks);
+
+  const std::vector<ScheduledFrame>& scheduled_frames() const {
+    return scheduled_frames_;
+  }
+
+ private:
+  void RunDoneCBForFramesUpTo(base::TimeTicks wall_ticks, Reason reason);
+
+  std::vector<ScheduledFrame> scheduled_frames_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestVideoFrameScheduler);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_FILTERS_TEST_VIDEO_FRAME_SCHEDULER_H_