cc: Make separate interface for BeginFrame ipc from OutputSurface

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 ef4cefd50d79bba7229d118be9a9d05c136bcab7..1f879918b95977b27c4f9fc8c83942b0173dc5eb 100644
--- a/cc/test/scheduler_test_common.cc
+++ b/cc/test/scheduler_test_common.cc
@@ -128,12 +128,14 @@ TestScheduler::TestScheduler(
     int layer_tree_host_id,
     const scoped_refptr<OrderedSimpleTaskRunner>& test_task_runner,
     base::PowerMonitor* power_monitor,
-    TestSchedulerFrameSourcesConstructor* frame_sources_constructor)
+    TestSchedulerFrameSourcesConstructor* frame_sources_constructor,
+    scoped_ptr<BeginFrameSource> external_begin_frame_source)
     : Scheduler(client,
                 scheduler_settings,
                 layer_tree_host_id,
                 test_task_runner,
                 power_monitor,
+                external_begin_frame_source.Pass(),
                 frame_sources_constructor),
       now_src_(now_src) {
 }