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 616 matching lines @@
       glyph_width_for_test_(0u) {
   set_truncate_length(kMaxTextLength);
 }
 
 RenderTextHarfBuzz::~RenderTextHarfBuzz() {}
 
 scoped_ptr<RenderText> RenderTextHarfBuzz::CreateInstanceOfSameType() const {
   return make_scoped_ptr(new RenderTextHarfBuzz);
 }
 
+bool RenderTextHarfBuzz::MultilineSupported() const {
+  return true;
+}
+
 const base::string16& RenderTextHarfBuzz::GetDisplayText() {
   // TODO(oshima): Consider supporting eliding multi-line text.
   // This requires max_line support first.
   if (multiline() ||
       elide_behavior() == NO_ELIDE ||
       elide_behavior() == FADE_TAIL) {
     // Call UpdateDisplayText to clear |display_text_| and |text_elided_|
     // on the RenderText class.
     UpdateDisplayText(0);
     update_display_text_ = false;
@@ skipping 821 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