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

chrome/browser/flag_descriptions.cc

 // Copyright 2017 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 "chrome/browser/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 737 matching lines @@
     "Material Design Ink Drop Animation Speed";
 
 const char kMaterialDesignInkDropAnimationSpeedDescription[] =
     "Sets the speed of the experimental visual feedback animations for "
     "material design.";
 
 const char kUiSlowAnimationsName[] = "Slow UI animations";
 
 const char kUiSlowAnimationsDescription[] = "Makes all UI animations slow.";
 
+const char kUiShowCompositedLayerBordersName[] =
+    "Show UI composited layer borders";
+
+const char kUiShowCompositedLayerBordersDescription[] =
+    "Show border around composited layers created by UI.";
+
+const char kUiShowCompositedLayerBordersRenderPass[] = "RenderPass";
+
+const char kUiShowCompositedLayerBordersSurface[] = "Surface";
+
+const char kUiShowCompositedLayerBordersLayer[] = "Layer";
+
+const char kUiShowCompositedLayerBordersAll[] = "All";
+
 #endif  // defined(USE_ASH)
 
 const char kJavascriptHarmonyShippingName[] =
     "Latest stable JavaScript features";
 
 const char kJavascriptHarmonyShippingDescription[] =
     "Some web pages use legacy or non-standard JavaScript extensions that "
     "may conflict with the latest JavaScript features. This flag allows "
     "disabling support of those features for compatibility with such "
     "pages.";
@@ skipping 2213 matching lines @@
 const char kEnableCopylessPasteDescription[] =
     "Provide suggestions for text input, based on your recent context. For "
     "example, if you looked at a restaurant website and switched to the Maps "
     "app, the keyboard would offer the name of that restaurant as a suggestion "
     "to enter into the search bar. The data is indexed locally, and never sent "
     "to the server. It's disabled in incognito mode.";
 
 #endif  // defined(OS_ANDROID)
 
 }  // namespace flag_descriptions