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

cc/layers/picture_layer_impl.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/layers/picture_layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 235 matching lines @@
                  visible_geometry_rect, texture_rect, texture_size,
                  nearest_neighbor_, RGBA_8888, quad_content_rect,
                  max_contents_scale, raster_source_);
     ValidateQuadResources(quad);
     return;
   }
 
   AppendDebugBorderQuad(render_pass, shared_quad_state->quad_layer_bounds,
                         shared_quad_state, append_quads_data);
 
-  if (ShowDebugBorders()) {
+  if (ShowDebugBorders(DebugBorderType::LAYER)) {
     for (PictureLayerTilingSet::CoverageIterator iter(
              tilings_.get(), max_contents_scale,
              shared_quad_state->visible_quad_layer_rect, ideal_contents_scale_);
          iter; ++iter) {
       SkColor color;
       float width;
       if (*iter && iter->draw_info().IsReadyToDraw()) {
         TileDrawInfo::Mode mode = iter->draw_info().mode();
         if (mode == TileDrawInfo::SOLID_COLOR_MODE) {
           color = DebugColors::SolidColorTileBorderColor();
@@ skipping 104 matching lines @@
           break;
         }
         case TileDrawInfo::OOM_MODE:
           break;  // Checkerboard.
       }
     }
 
     if (!has_draw_quad) {
       // Checkerboard.
       SkColor color = SafeOpaqueBackgroundColor();
-      if (ShowDebugBorders()) {
+      if (ShowDebugBorders(DebugBorderType::LAYER)) {
         // Fill the whole tile with the missing tile color.
         color = DebugColors::OOMTileBorderColor();
       }
       SolidColorDrawQuad* quad =
           render_pass->CreateAndAppendDrawQuad<SolidColorDrawQuad>();
       quad->SetNew(shared_quad_state, geometry_rect, visible_geometry_rect,
                    color, false);
       ValidateQuadResources(quad);
 
       if (geometry_rect.Intersects(scaled_viewport_for_tile_priority)) {
@@ skipping 1014 matching lines @@
   }
 
   invalidation_.Union(invalidation);
   tilings_->UpdateTilingsForImplSideInvalidation(invalidation);
   SetNeedsPushProperties();
   TRACE_EVENT_END1("cc", "PictureLayerImpl::InvalidateRegionForImages",
                    "Invalidation", invalidation.ToString());
 }
 
 }  // namespace cc