f18a6da7d7ac8ee9c8e7ee21949f336bdb0b211a
This attempts to make the Canvas API and some related features more likely to throw a Dart exception than crash when exposed to bad input. Depends on rolling tonic to https://fuchsia-review.googlesource.com/c/35742/ which this patch does not yet do, but I wanted to put it up for review to see if it was even a reasonable approach.
Description
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