[RenderText] Adding vertical alignment options

ui/gfx/text_constants.h

Index: ui/gfx/text_constants.h
diff --git a/ui/gfx/text_constants.h b/ui/gfx/text_constants.h
index c76adfa3a159c8a92b135c2ca45156736c547edd..986adac73e44bed6d2d02290232e8aeff33e7faa 100644
--- a/ui/gfx/text_constants.h
+++ b/ui/gfx/text_constants.h
@@ -23,6 +23,13 @@ enum HorizontalAlignment {
   ALIGN_TO_HEAD,  // Align the text to its first strong character's direction.
 };
 
+// Vertical text alignment modes.
+enum VerticalAlignment {
+  VALIGN_TOP = 0,  // Align the text's top edge with that of its display area.

[msw, 2015/03/30 19:19:12]

nit: one fewer space before the comments on this line and the next line.

[dschuyler, 2015/03/31 18:38:14]

git cl format insists on adding the spaces back.  Should I let cl format win or
try to force the spacing?

[msw, 2015/04/01 15:07:17]

I'd force the spacing tighter (like many other enums here), or optionally
shorten the 1st and 3rd comment by removing the word 'edge', so the bottom
comment can be aligned with the top two.

+  VALIGN_MIDDLE,   // Align the text's middle with that of its display area.
+  VALIGN_BOTTOM,  // Align the text's bottom edge with that of its display area.
+};
+
 // The directionality modes used to determine the base text direction.
 enum DirectionalityMode {
   DIRECTIONALITY_FROM_TEXT = 0, // Use the first strong character's direction.