am 3f73549b: Merge "For performance reason, we choose to block the picture...

am 3f73549b: Merge "For performance reason, we choose to block the picture update during drag and fling. For sites like nytimes.com, there is a JavaScript constantly updating the content. If we don\'t block the live update during drag/fling, frame rate can drop by 30%.

Merge commit '3f73549b' into froyo-plus-aosp

* commit '3f73549b':
  For performance reason, we choose to block the picture