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There is no point sending DeferredImages to cc until the PaintWorklet
has been properly registered; it just requires cc to have null-checking
logic. Instead, this CL adds support for off-thread PaintWorklet to
CSSPaintImageGenerator::IsImageGeneratorReady and uses it to defer
creating DeferredImages.

Bug: 965632
Change-Id: I351bf85ee0eec1df4ac401de2c78a4e99a38ea03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1622868Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663737}