Display skips swapping if overlays draw the damage

cc/output/delegating_renderer.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/delegating_renderer.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 48 matching lines @@
     capabilities_.max_msaa_samples = caps.gpu.max_samples;
   }
 }
 
 DelegatingRenderer::~DelegatingRenderer() {}
 
 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_);
 
   delegated_frame_data_ = make_scoped_ptr(new DelegatedFrameData);
   DelegatedFrameData& out_data = *delegated_frame_data_;
   out_data.device_scale_factor = device_scale_factor;
   // Move the render passes and resources into the |out_frame|.
   out_data.render_pass_list.swap(*render_passes_in_draw_order);
 
   // Collect all resource ids in the render passes into a ResourceIdArray.
   ResourceProvider::ResourceIdArray resources;
   for (const auto& render_pass : out_data.render_pass_list) {
     for (const auto& quad : render_pass->quad_list) {
       for (ResourceId resource_id : quad->resources)
         resources.push_back(resource_id);
     }
   }
   resource_provider_->PrepareSendToParent(resources, &out_data.resource_list);
+  return DrawFrameResult::DID_DRAW;
 }
 
 void DelegatingRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
   TRACE_EVENT0("cc,benchmark", "DelegatingRenderer::SwapBuffers");
   CompositorFrame compositor_frame;
   compositor_frame.metadata = metadata;
   compositor_frame.delegated_frame_data = std::move(delegated_frame_data_);
   output_surface_->SwapBuffers(&compositor_frame);
 }
 
@@ skipping 17 matching lines @@
   if (context_provider) {
     context_provider->ContextSupport()->SetSurfaceVisible(visible());
 
     // If we are not visible, we ask the context to aggressively free resources.
     context_provider->ContextSupport()->SetAggressivelyFreeResources(
         !visible());
   }
 }
 
 }  // namespace cc