reenable webkit paint pausing

bug:6016196

Change-Id: I4fcab8d84b39f033724c45845ef6c67b3071c509
diff --git a/core/java/android/webkit/WebViewClassic.java b/core/java/android/webkit/WebViewClassic.java
index c9a3ff1..8828109 100644
--- a/core/java/android/webkit/WebViewClassic.java
+++ b/core/java/android/webkit/WebViewClassic.java
@@ -4925,9 +4925,7 @@
         if (layer == 0 || isPictureAfterFirstLayout) {
             mWebViewCore.resumeWebKitDraw();
         } else if (queueFull) {
-            // temporarily disable webkit draw throttling
-            // TODO: re-enable
-            // mWebViewCore.pauseWebKitDraw();
+            mWebViewCore.pauseWebKitDraw();
         }
 
         if (mHTML5VideoViewProxy != null) {