Added a flag to the Canvas class which allows forcing an RTL directionality...

app/gfx/canvas_win.cc

 // Copyright (c) 2006-2008 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 "app/gfx/canvas.h"
 
 #include <limits>
 
 #include "app/gfx/font.h"
 #include "app/l10n_util.h"
@@ skipping 88 matching lines @@
   // DT_RTLREADING.
   //
   // This heuristic doesn't work for Chrome UI strings since even in RTL
   // locales, some of those might start with English text but we know they're
   // localized so we always want them to be right aligned, and their
   // directionality should be set as DT_RTLREADING.
   //
   // Caveat: If the string is purely LTR, don't set DTL_RTLREADING since when
   // the flag is set, LRE-PDF don't have the desired effect of rendering
   // multiline English-only text as LTR.
-  if (l10n_util::GetTextDirection() == l10n_util::RIGHT_TO_LEFT &&
-      (f & DT_RIGHT)) {
-    if (l10n_util::StringContainsStrongRTLChars(text)) {
-      f |= DT_RTLREADING;
-    }
+  //
+  // Note that if the caller is explicitly requesting displaying the text
+  // using RTL directionality then we respect that and pass DT_RTLREADING to
+  // ::DrawText even if the locale is LTR.
+  if ((flags & gfx::Canvas::FORCE_RTL_DIRECTIONALITY) ||
+      ((l10n_util::GetTextDirection() == l10n_util::RIGHT_TO_LEFT) &&
+       (f & DT_RIGHT) && l10n_util::StringContainsStrongRTLChars(text))) {
+    f |= DT_RTLREADING;
   }
+
   return f;
 }
 
 }  // anonymous namespace
 
 namespace gfx {
 
 Canvas::Canvas(int width, int height, bool is_opaque)
     : skia::PlatformCanvas(width, height, is_opaque) {
 }
@@ skipping 134 matching lines @@
         text_row[cur_x] |= 0xff << SK_A32_SHIFT;  // Make opaque.
       }
     }
   }
 
   // Draw the halo bitmap with blur.
   drawBitmap(text_bitmap, SkIntToScalar(x - 1), SkIntToScalar(y - 1));
 }
 
 }  // namespace gfx