Implement missing methods for NopCanvas

This overrides some methods from Canvas that should be no-ops in NopCanvas.

Bug: N/A
Test: N/A
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:b4a9fc542e52508a84b221884481113848e3cc72)
Merged-In: I636af4cf739ca584b7ca8c679899c9677f171d39
Change-Id: I636af4cf739ca584b7ca8c679899c9677f171d39
1 file changed