Using the sourceRect for calculating the viewport and texture coordinates was not enough when the source and destination rectangles were different sizes (generating mipmaps). BUG=709232 Change-Id: I2704ddf6e3da0939ad77d278ab495e53a2d9bc7d Reviewed-on: https://chromium-review.googlesource.com/473266 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
