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

ui/gfx/render_text_harfbuzz.cc

 // Copyright 2014 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_harfbuzz.h"
 
 #include <limits>
 
 #include "base/i18n/bidi_line_iterator.h"
 #include "base/i18n/break_iterator.h"
@@ skipping 635 matching lines @@
     update_display_text_ = false;
     display_run_list_.reset();
     return layout_text();
   }
 
   EnsureLayoutRunList();
   DCHECK(!update_display_text_);
   return text_elided() ? display_text() : layout_text();
 }
 
+bool RenderTextHarfBuzz::MultilineSupported() const {
+  return true;
+}
+
 Size RenderTextHarfBuzz::GetStringSize() {
   const SizeF size_f = GetStringSizeF();
   return Size(std::ceil(size_f.width()), size_f.height());
 }
 
 SizeF RenderTextHarfBuzz::GetStringSizeF() {
   EnsureLayout();
   return total_size_;
 }
 
@@ skipping 802 matching lines @@
   DCHECK(!update_layout_run_list_);
   DCHECK(!update_display_run_list_);
   return text_elided() ? display_run_list_.get() : &layout_run_list_;
 }
 
 const internal::TextRunList* RenderTextHarfBuzz::GetRunList() const {
   return const_cast<RenderTextHarfBuzz*>(this)->GetRunList();
 }
 
 }  // namespace gfx