Update VideoFrameScheduler API and add clockless and testing implementations.

media/filters/video_frame_scheduler_unittest.cc

+// 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.
+
+#include "base/bind.h"
+#include "base/debug/stack_trace.h"
+#include "base/run_loop.h"
+#include "media/base/video_frame.h"
+#include "media/filters/clockless_video_frame_scheduler.h"
+#include "media/filters/test_video_frame_scheduler.h"
+#include "media/filters/video_frame_scheduler_impl.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+static void DoNothing(const scoped_refptr<VideoFrame>& frame) {
+}
+
+static void CheckForReentrancy(std::string* stack_trace,
+                               const scoped_refptr<VideoFrame>& frame,
+                               VideoFrameScheduler::Reason reason) {
+  *stack_trace = base::debug::StackTrace().ToString();
+  base::MessageLoop::current()->PostTask(FROM_HERE,
+                                         base::MessageLoop::QuitClosure());
+}
+
+// Type parameterized test harness for validating API contract of
+// VideoFrameScheduler implementations.
+//
+// NOTE: C++ requires using "this" for derived class templates when referencing
+// class members.
+template <typename T>
+class VideoFrameSchedulerTest : public testing::Test {
+ public:
+  VideoFrameSchedulerTest() {}
+  virtual ~VideoFrameSchedulerTest() {}
+
+  base::MessageLoop message_loop_;
+  T scheduler_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoFrameSchedulerTest);
+};
+
+template <>
+VideoFrameSchedulerTest<ClocklessVideoFrameScheduler>::VideoFrameSchedulerTest()
+    : scheduler_(base::Bind(&DoNothing)) {
+}
+
+template <>
+VideoFrameSchedulerTest<VideoFrameSchedulerImpl>::VideoFrameSchedulerTest()
+    : scheduler_(message_loop_.message_loop_proxy(), base::Bind(&DoNothing)) {
+}
+
+TYPED_TEST_CASE_P(VideoFrameSchedulerTest);
+
+TYPED_TEST_P(VideoFrameSchedulerTest, ScheduleVideoFrameIsntReentrant) {
+  scoped_refptr<VideoFrame> frame =
+      VideoFrame::CreateBlackFrame(gfx::Size(8, 8));
+
+  std::string stack_trace;
+  this->scheduler_.ScheduleVideoFrame(
+      frame, base::TimeTicks(), base::Bind(&CheckForReentrancy, &stack_trace));
+  EXPECT_TRUE(stack_trace.empty()) << "Reentracy detected:\n" << stack_trace;
+}
+
+REGISTER_TYPED_TEST_CASE_P(VideoFrameSchedulerTest,
+                           ScheduleVideoFrameIsntReentrant);
+
+INSTANTIATE_TYPED_TEST_CASE_P(ClocklessVideoFrameScheduler,
+                              VideoFrameSchedulerTest,
+                              ClocklessVideoFrameScheduler);
+INSTANTIATE_TYPED_TEST_CASE_P(VideoFrameSchedulerImpl,
+                              VideoFrameSchedulerTest,
+                              VideoFrameSchedulerImpl);
+INSTANTIATE_TYPED_TEST_CASE_P(TestVideoFrameScheduler,
+                              VideoFrameSchedulerTest,
+                              TestVideoFrameScheduler);
+
+}  // namespace media