Display skips swapping if overlays draw the damage

cc/output/direct_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/direct_renderer.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 186 matching lines @@
   UMA_HISTOGRAM_COUNTS(
       "Renderer4.renderPassCount",
       base::saturated_cast<int>(render_passes_in_draw_order->size()));
 
   const RenderPass* root_render_pass = render_passes_in_draw_order->back();
   DCHECK(root_render_pass);
 
   DrawingFrame frame;
   frame.render_passes_in_draw_order = render_passes_in_draw_order;
   frame.root_render_pass = root_render_pass;
-  frame.root_damage_rect = Capabilities().using_partial_swap
-                               ? root_render_pass->damage_rect
-                               : root_render_pass->output_rect;
+  frame.root_damage_rect = root_render_pass->damage_rect;
   frame.root_damage_rect.Union(next_root_damage_rect_);
   next_root_damage_rect_ = gfx::Rect();
   frame.root_damage_rect.Intersect(gfx::Rect(device_viewport_rect.size()));
   frame.device_viewport_rect = device_viewport_rect;
   frame.device_clip_rect = device_clip_rect;
   frame.disable_picture_quad_image_filtering =
       disable_picture_quad_image_filtering;
 
   EnsureBackbuffer();
 
@@ skipping 350 matching lines @@
   ScopedResource* texture = render_pass_textures_.get(id);
   return texture && texture->id();
 }
 
 // static
 gfx::Size DirectRenderer::RenderPassTextureSize(const RenderPass* render_pass) {
   return render_pass->output_rect.size();
 }
 
 }  // namespace cc