Use ImageDecoder in ImageView.getDrawableFromUri

Bug: 63909536
Test: Existing CTS tests

ImageDecoder will bypass the InputStream if possible, allowing it to be
more efficient. In addition, it handles density scaling differently;
instead of using more RAM to scale the image up, it results in scaling
at draw time.

Change-Id: Ied7c0865a736f9ef0de367299264e18ccc3e0b92