Add svg parsing to CanvasKit viewer.html

Also enables ccpr and makes flags parsing more robust.

Change-Id: Ia98467403de87423a63167681b2ee635b0fa593a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/292690
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
6 files changed