The anchor point should align with the point on the path/shape/...

Also avoid recomputing transform-origin in ApplyMotionPathTransform
since the function takes origin_x/y as arguments, so those can be used
rather than recomputing the value(s).

Change-Id: I3c173cdc3d307057a37564a37b0e87044dbeaf9d
Reviewed-on: https://chromium-review.googlesource.com/808885
Commit-Queue: Fredrik Söderquist <[email protected]>
Reviewed-by: Eric Willigers <[email protected]>
Cr-Commit-Position: refs/heads/master@{#529282}