Display skips swapping if overlays draw the damage

cc/output/output_surface.h

 // 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.
 
 #ifndef CC_OUTPUT_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
@@ skipping 50 matching lines @@
   ~OutputSurface() override;
 
   struct Capabilities {
     Capabilities()
         : delegated_rendering(false),
           max_frames_pending(1),
           adjust_deadline_for_parent(true),
           uses_default_gl_framebuffer(true),
           flipped_output_surface(false),
           can_force_reclaim_resources(false),
-          delegated_sync_points_required(true) {}
+          delegated_sync_points_required(true),
+          schedules_overlays_without_swap(false) {}
     bool delegated_rendering;
     int max_frames_pending;
     // This doesn't handle the <webview> case, but once BeginFrame is
     // supported natively, we shouldn't need adjust_deadline_for_parent.
     bool adjust_deadline_for_parent;
     // Whether this output surface renders to the default OpenGL zero
     // framebuffer or to an offscreen framebuffer.
     bool uses_default_gl_framebuffer;
     // Whether this OutputSurface is flipped or not.
     bool flipped_output_surface;
     // Whether ForceReclaimResources can be called to reclaim all resources
     // from the OutputSurface.
     bool can_force_reclaim_resources;
     // True if sync points for resources are needed when swapping delegated
     // frames.
     bool delegated_sync_points_required;
+    // Whether the surface will display overlay planes as soon as they're
+    // scheduled rather than on the next swap.
+    bool schedules_overlays_without_swap;
   };
 
   const Capabilities& capabilities() const {
     return capabilities_;
   }
 
   virtual bool HasExternalStencilTest() const;
 
   // Obtain the 3d context or the software device associated with this output
   // surface. Either of these may return a null pointer, but not both.
@@ skipping 105 matching lines @@
   bool external_stencil_test_enabled_;
 
   base::WeakPtrFactory<OutputSurface> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_H_