Shows Japanese and English mixed queries correctly.

ui/gfx/render_text.h

Index: ui/gfx/render_text.h
diff --git a/ui/gfx/render_text.h b/ui/gfx/render_text.h
index c4d48fd79058f9e81fb51816ea923052d7a02165..2a3d94e00aad7e28e35e118d3d0ff4032792e1ae 100644
--- a/ui/gfx/render_text.h
+++ b/ui/gfx/render_text.h
@@ -147,6 +147,10 @@ class UI_EXPORT RenderText {
   // Get the first font in |font_list_|.
   const Font& GetFont() const;
 
+  // Returns the common height and baseline of the fonts in the font list.
+  int GetFontListHeight() const { return font_list_height_; }
+  int GetFontListBaseline() const { return font_list_baseline_; }
+
   bool cursor_enabled() const { return cursor_enabled_; }
   void SetCursorEnabled(bool cursor_enabled);
 
@@ -494,6 +498,12 @@ class UI_EXPORT RenderText {
 
   // A list of fonts used to render |text_|.
   FontList font_list_;
+  // The common height and baseline of the fonts in the font list.
+  // We cache these values because they change iff |font_list_| changes, and
+  // we need to scan font metrics for all the fonts in |font_list_| in order to
+  // get these values.
+  int font_list_height_;

[msw, 2013/07/11 22:47:29]

Can FontList cache these values itself?

[Yuki, 2013/07/12 08:25:53]

Yes, I've moved these cache to FontList.

+  int font_list_baseline_;
 
   // Logical selection range and visual cursor position.
   SelectionModel selection_model_;