cc: Introduce BeginFrame sequence numbers and acknowledgements.

cc/output/overlay_unittest.cc

Index: cc/output/overlay_unittest.cc
diff --git a/cc/output/overlay_unittest.cc b/cc/output/overlay_unittest.cc
index 4472c9ec8f8977e40b8c1b08ab71a017d6c32d20..0654a3aec701a06c751e2b9fb3e3d9f9d7221d35 100644
--- a/cc/output/overlay_unittest.cc
+++ b/cc/output/overlay_unittest.cc
@@ -1329,11 +1329,11 @@ class GLRendererWithOverlaysTest : public testing::Test {
     renderer_->DrawFrame(pass_list, 1.f, gfx::ColorSpace(), viewport_size);
   }
   void SwapBuffers() {
-    renderer_->SwapBuffers(std::vector<ui::LatencyInfo>());
+    renderer_->SwapBuffers(OutputSurfaceFrame());
     renderer_->SwapBuffersComplete();
   }
   void SwapBuffersWithoutComplete() {
-    renderer_->SwapBuffers(std::vector<ui::LatencyInfo>());
+    renderer_->SwapBuffers(OutputSurfaceFrame());
   }
   void SwapBuffersComplete() {
     renderer_->SwapBuffersComplete();