[cc] Fix CompositorFrameSinkSupport BeginFrameAck interface.

ash/laser/laser_pointer_view.cc

Index: ash/laser/laser_pointer_view.cc
diff --git a/ash/laser/laser_pointer_view.cc b/ash/laser/laser_pointer_view.cc
index d567506ef0ace5cd4a0bf9c863dea651d0e14a59..8ec447b7069662d18a5716e3866d91cf1811cd6c 100644
--- a/ash/laser/laser_pointer_view.cc
+++ b/ash/laser/laser_pointer_view.cc
@@ -21,6 +21,7 @@
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/timer/timer.h"
 #include "base/trace_event/trace_event.h"
+#include "cc/output/begin_frame_args.h"
 #include "cc/output/context_provider.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/resources/transferable_resource.h"
@@ -678,6 +679,12 @@ void LaserPointerView::UpdateSurface() {
   quad_state->opacity = 1.0f;
 
   cc::CompositorFrame frame;
+  // TODO(eseckler): LaserPointerView should use BeginFrames and set the ack
+  // accordingly.
+  frame.metadata.begin_frame_ack =
+      cc::BeginFrameAck(cc::BeginFrameArgs::kManualSourceId,
+                        cc::BeginFrameArgs::kStartingFrameNumber,
+                        cc::BeginFrameArgs::kStartingFrameNumber, 0, true);
   cc::TextureDrawQuad* texture_quad =
       render_pass->CreateAndAppendDrawQuad<cc::TextureDrawQuad>();
   float vertex_opacity[4] = {1.0, 1.0, 1.0, 1.0};