Fix multiline behaviors for RTL text.

ui/gfx/render_text.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_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <algorithm>
 #include <cstring>
 #include <string>
@@ skipping 27 matching lines @@
 
 namespace gfx {
 
 class Canvas;
 class Font;
 class RenderTextTest;
 
 namespace internal {
 
 // Internal helper class used by derived classes to draw text through Skia.
-class SkiaTextRenderer {
+class GFX_EXPORT SkiaTextRenderer {
  public:
   explicit SkiaTextRenderer(Canvas* canvas);
-  ~SkiaTextRenderer();
+  virtual ~SkiaTextRenderer();
 
   void SetDrawLooper(SkDrawLooper* draw_looper);
   void SetFontRenderParams(const FontRenderParams& params,
                            bool background_is_transparent);
   void SetTypeface(SkTypeface* typeface);
   void SetTextSize(SkScalar size);
   void SetFontFamilyWithStyle(const std::string& family, int font_style);
   void SetForegroundColor(SkColor foreground);
   void SetShader(SkShader* shader);
   // Sets underline metrics to use if the text will be drawn with an underline.
   // If not set, default values based on the size of the text will be used. The
   // two metrics must be set together.
   void SetUnderlineMetrics(SkScalar thickness, SkScalar position);
   void DrawSelection(const std::vector<Rect>& selection, SkColor color);
-  void DrawPosText(const SkPoint* pos,
-                   const uint16* glyphs,
-                   size_t glyph_count);
+  virtual void DrawPosText(const SkPoint* pos,
+                           const uint16* glyphs,
+                           size_t glyph_count);
   // Draw underline and strike-through text decorations.
   // Based on |SkCanvas::DrawTextDecorations()| and constants from:
   //   third_party/skia/src/core/SkTextFormatParams.h
-  void DrawDecorations(int x, int y, int width, bool underline, bool strike,
-                       bool diagonal_strike);
+  virtual void DrawDecorations(int x, int y, int width, bool underline,
+                               bool strike, bool diagonal_strike);
   // Finishes any ongoing diagonal strike run.
   void EndDiagonalStrike();
   void DrawUnderline(int x, int y, int width);
   void DrawStrike(int x, int y, int width) const;
 
  private:
   // Helper class to draw a diagonal line with multiple pieces of different
   // lengths and colors; to support text selection appearances.
   class DiagonalStrike {
    public:
@@ skipping 682 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated upon
   // OnLayoutTextAttributeChanged and OnDisplayTextAttributeChanged calls.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_