This is exactly the same as an earlier patch (https://codereview.chromium.org/23480014/) which seems to have gotten corrupted on the codereview site.

Disable texture clamping for HTML canvas. Note that the Raster path still clamps! 

This is based on: 
Do not clamp image to source rectangle for HTMLCanvasElement 
https://chromiumcodereview.appspot.com/17385016 

BUG=165711

Review URL: https://chromiumcodereview.appspot.com/23533048

git-svn-id: svn://svn.chromium.org/blink/trunk@157750 bbb929c8-8fbe-4397-9dbb-9b2b20218538