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

chrome/browser/flag_descriptions.h

 // 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.
 
 #ifndef CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 #define CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 
 // Includes needed for macros allowing conditional compilation of some strings.
 #include "build/build_config.h"
 #include "build/buildflag.h"
@@ skipping 809 matching lines @@
 // Description for the flag that sets the material design ink drop animtion
 // speed.
 extern const char kMaterialDesignInkDropAnimationSpeedDescription[];
 
 // Name for the flag that enables slow UI animations.
 extern const char kUiSlowAnimationsName[];
 
 // Description for the flag that enables slow UI animations.
 extern const char kUiSlowAnimationsDescription[];
 
+// Name for the flag to show UI composited layer borders.
+extern const char kUiShowCompositedLayerBordersName[];
+
+// Description for the flag to show UI composited layer borders.
+extern const char kUiShowCompositedLayerBordersDescription[];
+
+// Description of the flag option to show renderpass borders.
+extern const char kUiShowCompositedLayerBordersRenderPass[];
+
+// Description of the flag option to show surface borders.
+extern const char kUiShowCompositedLayerBordersSurface[];
+
+// Description of the flag option to show layer borders.
+extern const char kUiShowCompositedLayerBordersLayer[];
+
+// Description of the flag option to show all borders.
+extern const char kUiShowCompositedLayerBordersAll[];
+
 #endif  // defined(USE_ASH)
 
 // Title for the flag for latest (non-experimental) JavaScript fatures
 extern const char kJavascriptHarmonyShippingName[];
 
 // Description for the flag for latest (non-experimental) JavaScript fatures
 extern const char kJavascriptHarmonyShippingDescription[];
 
 // Title for the flag to enable JavaScript Harmony features.
 extern const char kJavascriptHarmonyName[];
@@ skipping 2392 matching lines @@
 extern const char kEnableCopylessPasteName[];
 
 // Description of the flag that enables Copyless Paste.
 extern const char kEnableCopylessPasteDescription[];
 
 #endif  // defined(OS_ANDROID)
 
 }  // namespace flag_descriptions
 
 #endif  // CHROME_BROWSER_FLAG_DESCRIPTIONS_H_