Display skips swapping if overlays draw the damage

cc/output/delegating_renderer.cc

Index: cc/output/delegating_renderer.cc
diff --git a/cc/output/delegating_renderer.cc b/cc/output/delegating_renderer.cc
index 0a7d91cd5d7a59145713721b7a7fa03e75b08e45..35deb34766a6d297dc5c2f838b92030a4b38a55f 100644
--- a/cc/output/delegating_renderer.cc
+++ b/cc/output/delegating_renderer.cc
@@ -66,11 +66,12 @@ const RendererCapabilitiesImpl& DelegatingRenderer::Capabilities() const {
   return capabilities_;
 }
 
-void DelegatingRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
-                                   float device_scale_factor,
-                                   const gfx::Rect& device_viewport_rect,
-                                   const gfx::Rect& device_clip_rect,
-                                   bool disable_picture_quad_image_filtering) {
+DrawFrameResult DelegatingRenderer::DrawFrame(
+    RenderPassList* render_passes_in_draw_order,
+    float device_scale_factor,
+    const gfx::Rect& device_viewport_rect,
+    const gfx::Rect& device_clip_rect,
+    bool disable_picture_quad_image_filtering) {
   TRACE_EVENT0("cc", "DelegatingRenderer::DrawFrame");
 
   DCHECK(!delegated_frame_data_);
@@ -90,6 +91,7 @@ void DelegatingRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
     }
   }
   resource_provider_->PrepareSendToParent(resources, &out_data.resource_list);
+  return DrawFrameResult::DID_DRAW;
 }
 
 void DelegatingRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {