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

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

Index: chrome/browser/ui/views/tabs/base_tab.cc
diff --git a/chrome/browser/ui/views/tabs/base_tab.cc b/chrome/browser/ui/views/tabs/base_tab.cc
index f5c063f87e2871f3e5768599300dd56dfa8e5bfc..2f8872a0aef3003e673a77709c9ffa78977efe52 100644
--- a/chrome/browser/ui/views/tabs/base_tab.cc
+++ b/chrome/browser/ui/views/tabs/base_tab.cc
@@ -172,6 +172,9 @@ BaseTab::~BaseTab() {
 }
 
 void BaseTab::SetData(const TabRendererData& data) {
+  if (data_.Equals(data))
+    return;
+
   TabRendererData old(data_);
   data_ = data;
 
@@ -211,6 +214,7 @@ void BaseTab::SetData(const TabRendererData& data) {
   DataChanged(old);
 
   Layout();
+  SchedulePaint();
 }
 
 void BaseTab::UpdateLoadingAnimation(TabRendererData::NetworkState state) {