Supports gfx::FontList in gfx::Canvas and ui::ElideText family.

ui/gfx/layout_text.h

Index: ui/gfx/layout_text.h
diff --git a/ui/gfx/layout_text.h b/ui/gfx/layout_text.h
new file mode 100644
index 0000000000000000000000000000000000000000..70957fb4123c5df3577b281c549774b2bdf894ee
--- /dev/null
+++ b/ui/gfx/layout_text.h
@@ -0,0 +1,31 @@
+// Copyright (c) 2013 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_LAYOUT_TEXT_H_
+#define UI_GFX_LAYOUT_TEXT_H_
+
+#include "base/basictypes.h"
+#include "base/strings/string16.h"
+#include "ui/base/ui_export.h"
+
+namespace gfx {
+
+class FontList;
+
+// LayoutText represents an interface of layout engines and provides APIs to get
+// text layout information.
+class UI_EXPORT LayoutText {

[Alexei Svitkine (slow), 2013/08/20 15:17:21]

I don't think this needs its own class. Just make GetStringWidth a free-standing
function under gfx.

[Yuki, 2013/08/20 16:45:42]

If everyone is okay to define gfx::GetStringWidth(), I'll remove LayoutText
class.

By the way, in that case, is it okay to define gfx::GetStringWidth() in
layout_text.h?
If you'd like to define the function in another file (or another name), please
let me know.

[Yuki, 2013/08/21 03:42:44]

Done.

+ public:
+  // Returns the number of horizontal pixels needed to display the specified
+  // |text| with |font_list|.
+  static int GetStringWidth(const base::string16& text,
+                            const FontList& font_list);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LayoutText);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_LAYOUT_TEXT_H_