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

chrome/browser/flag_descriptions.h

Index: chrome/browser/flag_descriptions.h
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index a09ecf68c7a5505303ecee59e7b52105068997e8..80e4ea400f73d5dc6827af3fcea67d04a106476b 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -827,6 +827,24 @@ 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 for the flag to show UI composited renderpass layer borders.

[danakj, 2017/04/13 22:35:42]

i think renderpass layer isnt right, there's no layer involved, i'd just say
RenderPass borders.

[reveman, 2017/04/13 23:32:47]

Done.

+extern const char kUiShowCompositedLayerBordersRenderpass[];
+
+// Description for the flag to show UI composited surface layer borders.
+extern const char kUiShowCompositedLayerBordersSurface[];
+
+// Description for the flag to show UI composited layer borders.

[danakj, 2017/04/13 22:35:42]

This is the same text as on kUiShowCompositedLayerBordersDescription, it would
be good to differentiate what this is vs that.

[reveman, 2017/04/13 23:32:47]

Changed all these to:
"Description of the flag option..." so it's clear they describe an option and
not a flag.

+extern const char kUiShowCompositedLayerBordersLayer[];
+
+// Description for the flag to show all UI composited layer borders.
+extern const char kUiShowCompositedLayerBordersAll[];
+
 #endif  // defined(USE_ASH)
 
 // Title for the flag for latest (non-experimental) JavaScript fatures