Bug 826093 (Part 1) - Add ClippedImage. r=joe
Bug 826093 (Part 2) - Create a static utility class for image operations. r=joe, sr=bz
Bug 826093 (Part 3) - Use ClippedImage instead of ExtractFrame for -moz-image-rect. r=bz
Bug 826093 (Part 4) - Use ClippedImage instead of ExtractFrame for border-image. r=bz
Bug 826093 (Part 5) - Remove imgIContainer::ExtractFrame. r=joe, sr=bz
Bug 857936 - ARIA columnheader/rowheader should inherit editable state, r=tbsaunde