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 3b35a54a9b713423dd91c55b428dc6997937f01c..8f06627829883212e2b1a021a4832bb297ec5840 100644
--- a/cc/test/scheduler_test_common.cc
+++ b/cc/test/scheduler_test_common.cc
@@ -14,4 +14,27 @@ void FakeTimeSourceClient::OnTimerTick() {
 
 base::TimeTicks FakeDelayBasedTimeSource::Now() const { return now_; }
 
+DrawSwapReadbackResult
+StubSchedulerClient::ScheduledActionDrawAndSwapIfPossible() {
+  return DrawSwapReadbackResult(
+      DrawSwapReadbackResult::DRAW_SUCCESS, false, false);
+}
+DrawSwapReadbackResult StubSchedulerClient::ScheduledActionDrawAndSwapForced() {
+  return DrawSwapReadbackResult(
+      DrawSwapReadbackResult::DRAW_SUCCESS, false, false);
+}
+DrawSwapReadbackResult StubSchedulerClient::ScheduledActionDrawAndReadback() {
+  return DrawSwapReadbackResult(
+      DrawSwapReadbackResult::DRAW_SUCCESS, false, false);
+}
+base::TimeDelta StubSchedulerClient::DrawDurationEstimate() {
+  return base::TimeDelta::FromMilliseconds(4);
+}
+base::TimeDelta StubSchedulerClient::BeginMainFrameToCommitDurationEstimate() {
+  return base::TimeDelta::FromMilliseconds(3);
+}
+base::TimeDelta StubSchedulerClient::CommitToActivateDurationEstimate() {
+  return base::TimeDelta::FromMilliseconds(2);
+}
+
 }  // namespace cc