[cc] Fix CompositorFrameSinkSupport BeginFrameAck interface.

android_webview/browser/surfaces_instance.cc

Index: android_webview/browser/surfaces_instance.cc
diff --git a/android_webview/browser/surfaces_instance.cc b/android_webview/browser/surfaces_instance.cc
index e9b124501dc20882f2b3c4da5576d956cc0897ec..ef8e93ff17f210acf3f5b5cf4403528920129e6a 100644
--- a/android_webview/browser/surfaces_instance.cc
+++ b/android_webview/browser/surfaces_instance.cc
@@ -134,6 +134,11 @@ void SurfacesInstance::DrawAndSwap(const gfx::Size& viewport,
                        cc::SurfaceDrawQuadType::PRIMARY, nullptr);
 
   cc::CompositorFrame frame;
+  // We draw synchronously, so acknowledge a manual BeginFrame.
+  frame.metadata.begin_frame_ack =
+      cc::BeginFrameAck(cc::BeginFrameArgs::kManualSourceId,
+                        cc::BeginFrameArgs::kStartingFrameNumber,
+                        cc::BeginFrameArgs::kStartingFrameNumber, 0, true);
   frame.render_pass_list.push_back(std::move(render_pass));
   frame.metadata.referenced_surfaces = child_ids_;
 
@@ -165,6 +170,11 @@ void SurfacesInstance::RemoveChildId(const cc::SurfaceId& child_id) {
 
 void SurfacesInstance::SetEmptyRootFrame() {
   cc::CompositorFrame empty_frame;
+  // We draw synchronously, so acknowledge a manual BeginFrame.
+  empty_frame.metadata.begin_frame_ack =
+      cc::BeginFrameAck(cc::BeginFrameArgs::kManualSourceId,
+                        cc::BeginFrameArgs::kStartingFrameNumber,
+                        cc::BeginFrameArgs::kStartingFrameNumber, 0, true);
   empty_frame.metadata.referenced_surfaces = child_ids_;
   support_->SubmitCompositorFrame(root_id_, std::move(empty_frame));
 }