[2dcontext-tests] Fix crop_area_byte_length calculation in crop_image and add tests (#5579)

• From: Josh Matthews <web-platform-tests-notifications@w3.org>
• Date: Mon, 17 Apr 2017 02:00:43 GMT
• To: public-web-platform-tests-notifications@w3.org
• Message-Id: <<web-platform-tests_issue_5579@w3.org>>

Upstreamed from https://github.com/servo/servo/pull/15929 [ci skip]

View on GitHub: https://github.com/w3c/web-platform-tests/pull/5579

Received on Monday, 17 April 2017 02:00:56 UTC