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

chrome/browser/ui/views/tabs/base_tab_strip.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_strip.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/view_ids.h"
 #include "chrome/browser/ui/views/tabs/dragged_tab_controller.h"
 #include "chrome/browser/ui/views/tabs/tab_strip_controller.h"
@@ skipping 157 matching lines @@
 
   tab_data_.insert(tab_data_.begin() + to_tab_data_index, data);
 
   StartMoveTabAnimation();
 }
 
 void BaseTabStrip::SetTabData(int model_index, const TabRendererData& data) {
   BaseTab* tab = GetBaseTabAtModelIndex(model_index);
   bool mini_state_changed = tab->data().mini != data.mini;
   tab->SetData(data);
-  tab->SchedulePaint();
 
   if (mini_state_changed) {
     if (GetWindow() && GetWindow()->IsVisible())
       StartMiniTabAnimation();
     else
       DoLayout();
   }
 }
 
 BaseTab* BaseTabStrip::GetBaseTabAtModelIndex(int model_index) const {
@@ skipping 299 matching lines @@
 
   StopAnimating(false);
 
   GenerateIdealBounds();
 
   for (int i = 0; i < tab_count(); ++i)
     tab_data_[i].tab->SetBoundsRect(tab_data_[i].ideal_bounds);
 
   SchedulePaint();
 }