Don't repaint tab when TabRenderData hasn't changed.

chrome/browser/ui/views/tabs/base_tab.cc

 // Copyright (c) 2011 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/base_tab.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
@@ skipping 154 matching lines @@
   close_button_->SetAnimationDuration(0);
   AddChildView(close_button_);
 
   SetContextMenuController(this);
 }
 
 BaseTab::~BaseTab() {
 }
 
 void BaseTab::SetData(const TabRendererData& data) {
+  if (data_.Equals(data))
+    return;
+
   TabRendererData old(data_);
   data_ = data;
 
   if (data_.IsCrashed()) {
     if (!should_display_crashed_favicon_ && !IsPerformingCrashAnimation()) {
       // When --reload-killed-tabs is specified, then the idea is that
       // when tab is killed, the tab has no visual indication that it
       // died and should reload when the tab is next focused without
       // the user seeing the killed tab page.
       //
@@ skipping 19 matching lines @@
       StopCrashAnimation();
     ResetCrashedFavIcon();
   }
 
   // Sets the accessible name for the tab.
   SetAccessibleName(data_.title);
 
   DataChanged(old);
 
   Layout();
+  SchedulePaint();
 }
 
 void BaseTab::UpdateLoadingAnimation(TabRendererData::NetworkState state) {
   // If this is an extension app and a command line flag is set,
   // then disable the throbber.
   throbber_disabled_ = data().app &&
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kAppsNoThrob);
 
   if (throbber_disabled_)
     return;
@@ skipping 294 matching lines @@
 // static
 void BaseTab::InitResources() {
   static bool initialized = false;
   if (!initialized) {
     initialized = true;
     font_ = new gfx::Font(
         ResourceBundle::GetSharedInstance().GetFont(ResourceBundle::BaseFont));
     font_height_ = font_->GetHeight();
   }
 }