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Note that JPEG YUV decoding is still only enabled for testing.
In a follow-up change, |allow_decode_to_yuv_| will be set by
RuntimeEnabledFeatures::DecodeJpeg420ImagesToYUVEnabled which will
require rebasing some existing web tests.

* Set pixmap width to the stride width (instead of image width)
* Decrease unnecessary repetitive calls to JpegImageDecoder::DecodeSize
  (called by PaintImage::IsYuv) by providing plane indices when
  available.

Bug: 919627
Change-Id: Ie3314b5cda9f075c62f7595ff22c41f4dad1a74e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783206
Commit-Queue: Sasha McIntosh <sashamcintosh@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708341}