Blit9: Pass the dest rect to setViewportAndShaderConstants. 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>