init fDeviceClipBounds for empty canvas

Otherwise, it is uninitialized when there is no init device.

Change-Id: I3594f6fb4cf6380b5ba74ff5e4955fab8f449146
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291236
Reviewed-by: Jim Graham <jimgraham@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed