Cache gfx::RenderText instances in views::Label.

ui/gfx/render_text_mac.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_MAC_H_
 #define UI_GFX_RENDER_TEXT_MAC_H_
 
 #include <ApplicationServices/ApplicationServices.h>
 
 #include <string>
@@ skipping 10 matching lines @@
 // Note: The current implementation only supports drawing and sizing the text,
 //       but not text selection or cursor movement.
 class RenderTextMac : public RenderText {
  public:
   RenderTextMac();
   ~RenderTextMac() override;
 
   // RenderText:
   scoped_ptr<RenderText> CreateInstanceOfSameType() const override;
   const base::string16& GetDisplayText() override;
+  bool MultilineSupported() const override;
   Size GetStringSize() override;
   SizeF GetStringSizeF() override;
   SelectionModel FindCursorPosition(const Point& point) override;
   std::vector<FontSpan> GetFontSpansForTesting() override;
 
  protected:
   // RenderText:
   int GetDisplayTextBaseline() override;
   SelectionModel AdjacentCharSelectionModel(
       const SelectionModel& selection,
@@ skipping 55 matching lines @@
 
   // Indicates that |runs_| are valid, set by |ComputeRuns()|.
   bool runs_valid_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextMac);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_MAC_H_