Add RenderText DirectionalityMode enum and support; etc.

ui/gfx/pango_util.h

 // Copyright (c) 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.
 
 #ifndef UI_GFX_PANGO_UTIL_H_
 #define UI_GFX_PANGO_UTIL_H_
 
 #include <cairo/cairo.h>
 #include <pango/pango.h>
 #include <string>
@@ skipping 46 matching lines @@
                                         const gfx::Rect& bounds,
                                         const gfx::Rect& clip,
                                         SkColor text_color,
                                         int flags);
 
 // ----------------------------------------------------------------------------
 // All other methods in this file are only to be used within the ui/ directory.
 // They are shared with internal skia interfaces.
 // ----------------------------------------------------------------------------
 
-// Setup pango layout |layout|, including set layout text as |text|, font
-// description based on |font|, width as |width| in PANGO_SCALE for RTL lcoale,
-// and set up whether auto-detect directionality, alignment, ellipsis, word
-// wrapping, resolution etc.
+// Setup pango |layout|; set the |text|, the font description based on |font|,
+// the |width| in PANGO_SCALE for RTL locale, the base |text_direction|,
+// alignment, ellipsis, word wrapping, resolution, etc.
 void SetupPangoLayout(PangoLayout* layout,
                       const string16& text,
                       const gfx::Font& font,
                       int width,
                       base::i18n::TextDirection text_direction,
                       int flags);
 
 // Setup pango layout |layout| the same way as SetupPangoLayout(), except this
 // sets the font description based on |font_description|.
 void SetupPangoLayoutWithFontDescription(
@@ skipping 34 matching lines @@
 size_t GetPangoFontSizeInPixels(PangoFontDescription* pango_font);
 
 // Retrieves the Pango metrics for a Pango font description. Caches the metrics
 // and never frees them. The metrics objects are relatively small and very
 // expensive to look up.
 PangoFontMetrics* GetPangoFontMetrics(PangoFontDescription* desc);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PANGO_UTIL_H_