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

chrome/browser/ui/views/tabs/tab.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 "chrome/browser/ui/views/tabs/tab.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 421 matching lines @@
   // So we get don't get enter/exit on children and don't prematurely stop the
   // hover.
   set_notify_enter_exit_on_child(true);
 
   set_id(VIEW_ID_TAB);
 
   title_->SetHorizontalAlignment(gfx::ALIGN_TO_HEAD);
   title_->SetElideBehavior(gfx::FADE_TAIL);
   title_->SetHandlesTooltips(false);
   title_->SetAutoColorReadabilityEnabled(false);
+  title_->set_collapse_when_hidden(true);
   title_->SetText(CoreTabHelper::GetDefaultTitle());
   AddChildView(title_);
 
   SetEventTargeter(
       scoped_ptr<views::ViewTargeter>(new views::ViewTargeter(this)));
 
   // Add the Close Button.
   close_button_ = new TabCloseButton(this);
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   close_button_->SetImage(views::CustomButton::STATE_NORMAL,
@@ skipping 353 matching lines @@
     int title_left = favicon_bounds_.right() + kFaviconTitleSpacing;
     int title_width = lb.width() - title_left;
     if (showing_media_indicator_) {
       title_width = media_indicator_button_->x() - kViewSpacing - title_left;
     } else if (close_button_->visible()) {
       // Allow the title to overlay the close button's empty border padding.
       title_width = close_button_->x() + close_button_->GetInsets().left() -
           kViewSpacing - title_left;
     }
     gfx::Rect rect(title_left, lb.y(), std::max(title_width, 0), lb.height());
-    const int title_height = title_->GetPreferredSize().height();
+    const int title_height = title_->GetHeightForWidth(title_width);
     if (title_height > rect.height()) {
       rect.set_y(lb.y() - (title_height - rect.height()) / 2);
       rect.set_height(title_height);
     }
     title_->SetBoundsRect(rect);
   }
   title_->SetVisible(show_title);
 }
 
 void Tab::OnThemeChanged() {
@@ skipping 773 matching lines @@
                          const gfx::ImageSkia& image) {
   DCHECK_NE(scale_factor, ui::SCALE_FACTOR_NONE);
   ImageCacheEntry entry;
   entry.resource_id = resource_id;
   entry.scale_factor = scale_factor;
   entry.image = image;
   image_cache_->push_front(entry);
   if (image_cache_->size() > kMaxImageCacheSize)
     image_cache_->pop_back();
 }