Add RenderText DirectionalityMode enum and support; etc.

ui/gfx/render_text_mac.cc

 // 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.
 
 #include "ui/gfx/render_text_mac.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 
 #include <cmath>
 #include <utility>
@@ skipping 69 matching lines @@
 }  // namespace
 
 namespace gfx {
 
 RenderTextMac::RenderTextMac() : common_baseline_(0), runs_valid_(false) {
 }
 
 RenderTextMac::~RenderTextMac() {
 }
 
-base::i18n::TextDirection RenderTextMac::GetTextDirection() {
-  return base::i18n::LEFT_TO_RIGHT;
-}
-
 Size RenderTextMac::GetStringSize() {
   EnsureLayout();
   return string_size_;
 }
 
 int RenderTextMac::GetBaseline() {
   EnsureLayout();
   return common_baseline_;
 }
 
@@ skipping 72 matching lines @@
       CFDictionaryCreate(NULL, keys, values, arraysize(keys), NULL,
                          &kCFTypeDictionaryValueCallBacks));
 
   base::mac::ScopedCFTypeRef<CFStringRef> cf_text(
       base::SysUTF16ToCFStringRef(text()));
   base::mac::ScopedCFTypeRef<CFAttributedStringRef> attr_text(
       CFAttributedStringCreate(NULL, cf_text, attributes));
   base::mac::ScopedCFTypeRef<CFMutableAttributedStringRef> attr_text_mutable(
       CFAttributedStringCreateMutableCopy(NULL, 0, attr_text));
 
+  // TODO(asvitkine|msw): Respect GetTextDirection(), which may not match the
+  // natural text direction. See kCTTypesetterOptionForcedEmbeddingLevel, etc.
+
   ApplyStyles(attr_text_mutable, ct_font);
   line_.reset(CTLineCreateWithAttributedString(attr_text_mutable));
 
   CGFloat ascent = 0;
   CGFloat descent = 0;
   CGFloat leading = 0;
   // TODO(asvitkine): Consider using CTLineGetBoundsWithOptions() on 10.8+.
   double width = CTLineGetTypographicBounds(line_, &ascent, &descent, &leading);
   string_size_ = Size(width, ascent + descent + leading);
   common_baseline_ = ascent;
@@ skipping 173 matching lines @@
     run_origin.offset(run_width, 0);
   }
   runs_valid_ = true;
 }
 
 RenderText* RenderText::CreateInstance() {
   return new RenderTextMac;
 }
 
 }  // namespace gfx