cc: Add SetChildrenNeedBeginFrames() & SendBeginFramesToChildren()

cc/scheduler/scheduler_state_machine_unittest.cc

Index: cc/scheduler/scheduler_state_machine_unittest.cc
diff --git a/cc/scheduler/scheduler_state_machine_unittest.cc b/cc/scheduler/scheduler_state_machine_unittest.cc
index 85160ed1c482f5e0cd89cc881e542d06f3312a69..af6d83a0d5e3028b87d4c1f664d9acc2ada5bf10 100644
--- a/cc/scheduler/scheduler_state_machine_unittest.cc
+++ b/cc/scheduler/scheduler_state_machine_unittest.cc
@@ -1823,5 +1823,20 @@ TEST(SchedulerStateMachineTest, TestSetNeedsAnimateAfterAnimate) {
       SchedulerStateMachine::ACTION_DRAW_AND_SWAP_IF_POSSIBLE);
 }
 
+TEST(SchedulerStateMachineTest, TestForwardBeginFramesToChildren) {
+  SchedulerSettings settings;
+  settings.forward_begin_frames_to_children = true;
+  StateMachine state(settings);
+  state.SetCanStart();
+  state.UpdateState(state.NextAction());
+  state.CreateAndInitializeOutputSurfaceWithActivatedCommit();
+  state.SetVisible(true);
+  state.SetCanDraw(true);
+
+  EXPECT_FALSE(state.BeginFrameNeeded());
+  state.SetChildrenNeedBeginFrames(true);
+  EXPECT_TRUE(state.BeginFrameNeeded());
+}
+
 }  // namespace
 }  // namespace cc