ui: Add debug flag to show composited layer borders in ChromeOS UI.

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include <stddef.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 336 matching lines @@
   settings.renderer_settings.allow_antialiasing &=
       !cmd.HasSwitch(cc::switches::kDisableCompositedAntialiasing);
   // The means the renderer compositor has 2 possible modes:
   // - Threaded compositing with a scheduler.
   // - Single threaded compositing without a scheduler (for layout tests only).
   // Using the scheduler in layout tests introduces additional composite steps
   // that create flakiness.
   settings.single_thread_proxy_scheduler = false;
 
   // These flags should be mirrored by UI versions in ui/compositor/.
-  settings.initial_debug_state.show_debug_borders =
-      cmd.HasSwitch(cc::switches::kShowCompositedLayerBorders);
+  if (cmd.HasSwitch(cc::switches::kShowCompositedLayerBorders))
+    settings.initial_debug_state.show_debug_borders.set();
   settings.initial_debug_state.show_layer_animation_bounds_rects =
       cmd.HasSwitch(cc::switches::kShowLayerAnimationBounds);
   settings.initial_debug_state.show_paint_rects =
       cmd.HasSwitch(switches::kShowPaintRects);
   settings.initial_debug_state.show_property_changed_rects =
       cmd.HasSwitch(cc::switches::kShowPropertyChangedRects);
   settings.initial_debug_state.show_surface_damage_rects =
       cmd.HasSwitch(cc::switches::kShowSurfaceDamageRects);
   settings.initial_debug_state.show_screen_space_rects =
       cmd.HasSwitch(cc::switches::kShowScreenSpaceRects);
@@ skipping 778 matching lines @@
 void RenderWidgetCompositor::SetContentSourceId(uint32_t id) {
   layer_tree_host_->SetContentSourceId(id);
 }
 
 void RenderWidgetCompositor::SetLocalSurfaceId(
     const cc::LocalSurfaceId& local_surface_id) {
   layer_tree_host_->SetLocalSurfaceId(local_surface_id);
 }
 
 }  // namespace content