Enable GPU process rendering of extensions on TOUCH_UI.

content/browser/tab_contents/tab_contents.cc

Index: content/browser/tab_contents/tab_contents.cc
diff --git a/content/browser/tab_contents/tab_contents.cc b/content/browser/tab_contents/tab_contents.cc
index 061846bf5df2c3460e6f30a67300fcbe2958921c..ac7404c2009aee9974977d8d0e06149ff0ccf8ed 100644
--- a/content/browser/tab_contents/tab_contents.cc
+++ b/content/browser/tab_contents/tab_contents.cc
@@ -1814,7 +1814,10 @@ WebPreferences TabContents::GetWebkitPrefs() {
   // Force accelerated compositing and 2d canvas off for chrome:, about: and
   // chrome-devtools: pages (unless it's specifically allowed).
   if ((GetURL().SchemeIs(chrome::kChromeDevToolsScheme) ||
+#if !defined(TOUCH_UI)
+      // Allow accelerated compositing for keyboard and log in screen.
       GetURL().SchemeIs(chrome::kChromeUIScheme) ||
+#endif
       GetURL().SchemeIs(chrome::kAboutScheme)) &&
       !web_prefs.allow_webui_compositing) {
     web_prefs.accelerated_compositing_enabled = false;