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

ui/gfx/render_text_mac.cc

 // 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.
 
 #include "ui/gfx/render_text_mac.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 10 matching lines @@
     : common_baseline_(0), runs_valid_(false) {
 }
 
 RenderTextMac::~RenderTextMac() {
 }
 
 scoped_ptr<RenderText> RenderTextMac::CreateInstanceOfSameType() const {
   return make_scoped_ptr(new RenderTextMac);
 }
 
+bool RenderTextMac::MultilineSupported() const {
+  return false;
+}
+
 const base::string16& RenderTextMac::GetDisplayText() {
   return text_elided() ? display_text() : layout_text();
 }
 
 Size RenderTextMac::GetStringSize() {
   SizeF size_f = GetStringSizeF();
   return Size(std::ceil(size_f.width()), size_f.height());
 }
 
 SizeF RenderTextMac::GetStringSizeF() {
@@ skipping 340 matching lines @@
     CTUnderlineStyle value = kCTUnderlineStyleNone;
     if (underline && CFNumberGetValue(underline, kCFNumberSInt32Type, &value))
       run->underline = (value == kCTUnderlineStyleSingle);
 
     run_origin.offset(run_width, 0);
   }
   runs_valid_ = true;
 }
 
 }  // namespace gfx