Refactoring the way begin frame sources inside scheduler work.

cc/test/scheduler_test_common.cc

Index: cc/test/scheduler_test_common.cc
diff --git a/cc/test/scheduler_test_common.cc b/cc/test/scheduler_test_common.cc
index 7001b59ddeadd00e0c4563aa4acdb5f4fceed335..5d81f64306ee617111e24c0e4a45238a40a022ce 100644
--- a/cc/test/scheduler_test_common.cc
+++ b/cc/test/scheduler_test_common.cc
@@ -34,6 +34,20 @@ std::string TestDelayBasedTimeSource::TypeString() const {
 TestDelayBasedTimeSource::~TestDelayBasedTimeSource() {
 }
 
+bool FakeBeginFrameSource::NeedsBeginFrames() {
+  return needs_begin_frames_;
+}
+void FakeBeginFrameSource::SetNeedsBeginFrames(bool needs_begin_frames) {
+  needs_begin_frames_ = needs_begin_frames;
+}
+void FakeBeginFrameSource::FinishedFrame(size_t remaining_frames) {
+  remaining_frames_ = remaining_frames;
+}
+void FakeBeginFrameSource::AsValueInto(base::debug::TracedValue* dict) const {
+  dict->SetString("type", "FakeBeginFrameSource");
+  BeginFrameSource::AsValueInto(dict);
+}
+
 TestScheduler::TestScheduler(
     scoped_refptr<TestNowSource> now_src,
     SchedulerClient* client,
@@ -46,12 +60,20 @@ TestScheduler::TestScheduler(
                 test_task_runner),
       now_src_(now_src),
       test_task_runner_(test_task_runner.get()) {
+}
+
+void TestScheduler::SetUpBackgroundFrameSource() {
+  background_frame_source_store_ = TestSyntheticBeginFrameSource::Create(
+      now_src_, test_task_runner_, base::TimeDelta::FromSeconds(1));
+}
+
+void TestScheduler::SetUpPrimaryFrameSource() {
   if (!settings_.begin_frame_scheduling_enabled) {
-    scoped_refptr<DelayBasedTimeSource> time_source =
-        TestDelayBasedTimeSource::Create(
-            now_src, VSyncInterval(), test_task_runner_);
-    synthetic_begin_frame_source_.reset(
-        new SyntheticBeginFrameSource(this, time_source));
+    primary_frame_source_store_ = TestSyntheticBeginFrameSource::Create(
+        now_src_, test_task_runner_, BeginFrameArgs::DefaultInterval());
+    primary_frame_source_ = primary_frame_source_store_.get();
+  } else {
+    Scheduler::SetUpPrimaryFrameSource();
   }
 }