Refactoring the way begin frame sources inside scheduler work.

cc/test/scheduler_test_common.h

Index: cc/test/scheduler_test_common.h
diff --git a/cc/test/scheduler_test_common.h b/cc/test/scheduler_test_common.h
index a50233653410836c44189d5d53381dfaf0d6d3b3..f2d901a8aab99da639cd23c654e08a39aae69d64 100644
--- a/cc/test/scheduler_test_common.h
+++ b/cc/test/scheduler_test_common.h
@@ -27,7 +27,7 @@ class FakeTimeSourceClient : public TimeSourceClient {
   virtual void OnTimerTick() OVERRIDE;
 
  protected:
-  bool tick_called_;
+  bool tick_called_ = false;
 };
 
 class FakeDelayBasedTimeSource : public DelayBasedTimeSource {
@@ -73,6 +73,82 @@ class TestDelayBasedTimeSource : public DelayBasedTimeSource {
   scoped_refptr<TestNowSource> now_src_;
 };
 
+struct FakeBeginFrameSource : public BeginFrameSource {
+  bool needs_begin_frames_ = false;
+  bool remaining_frames_ = false;
+
+  BeginFrameObserver* GetObserver() { return observer_; }
+
+  void TestSendBeginFrame(const BeginFrameArgs& args) {
+    CallOnBeginFrame(args);
+  }
+
+  // BeginFrameSource
+  virtual bool NeedsBeginFrames() const OVERRIDE;
+  virtual void SetNeedsBeginFrames(bool needs_begin_frames) OVERRIDE;
+  virtual void DidFinishFrame(size_t remaining_frames) OVERRIDE;
+
+  virtual void AsValueInto(base::debug::TracedValue* dict) const OVERRIDE;
+
+  virtual ~FakeBeginFrameSource() {}
+};
+
+class TestBackToBackBeginFrameSource : public BackToBackBeginFrameSource {
+ public:
+  virtual ~TestBackToBackBeginFrameSource();
+
+  static scoped_ptr<TestBackToBackBeginFrameSource> Create(
+      scoped_refptr<TestNowSource> now_src,
+      base::SingleThreadTaskRunner* task_runner) {
+    return make_scoped_ptr(
+        new TestBackToBackBeginFrameSource(now_src, task_runner));
+  }
+
+ protected:
+  TestBackToBackBeginFrameSource(scoped_refptr<TestNowSource> now_src,
+                                 base::SingleThreadTaskRunner* task_runner);
+
+  virtual base::TimeTicks Now() OVERRIDE;
+
+  scoped_refptr<TestNowSource> now_src_;
+};
+
+class TestSyntheticBeginFrameSource : public SyntheticBeginFrameSource {
+ public:
+  virtual ~TestSyntheticBeginFrameSource();
+
+  static scoped_ptr<TestSyntheticBeginFrameSource> Create(
+      scoped_refptr<TestNowSource> now_src,
+      OrderedSimpleTaskRunner* task_runner,
+      base::TimeDelta initial_interval) {
+    return make_scoped_ptr(
+        new TestSyntheticBeginFrameSource(TestDelayBasedTimeSource::Create(
+            now_src, initial_interval, task_runner)));
+  }
+
+ protected:
+  TestSyntheticBeginFrameSource(
+      scoped_refptr<DelayBasedTimeSource> time_source);
+};
+
+class TestSchedulerFrameSourcesConstructor
+    : public NON_EXPORTED_BASE(SchedulerFrameSourcesConstructor) {
+ public:
+  explicit TestSchedulerFrameSourcesConstructor(
+      OrderedSimpleTaskRunner* test_task_runner,
+      TestNowSource* now_src);
+  virtual ~TestSchedulerFrameSourcesConstructor();
+
+ protected:
+  virtual BeginFrameSource* ConstructPrimaryFrameSource(
+      Scheduler* scheduler) OVERRIDE;
+  virtual BeginFrameSource* ConstructBackgroundFrameSource(
+      Scheduler* scheduler) OVERRIDE;
+
+  OrderedSimpleTaskRunner* test_task_runner_;
+  TestNowSource* now_src_;
+};
+
 class TestScheduler : public Scheduler {
  public:
   static scoped_ptr<TestScheduler> Create(
@@ -97,10 +173,7 @@ class TestScheduler : public Scheduler {
     return begin_retro_frame_args_.empty();
   }
 
-  bool IsSyntheticBeginFrameSourceActive() const {
-    return synthetic_begin_frame_source_->IsActive();
-  }
-
+  BeginFrameSource& frame_source() { return *frame_source_; }
   OrderedSimpleTaskRunner& task_runner() { return *test_task_runner_; }
 
   virtual ~TestScheduler();