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The current yuv_decoding JPEG decoding Telemetry story is
misleading for two reasons: it does not decode to or render
from YUV (see crbug.com/921875) and it uses canvas.toDataURL
to create random test images each time, which means encoding
duration is also measured. Furthermore, the test flashes
rapidly and could potentially trigger photosensitive epilepsy.

Because YUV decoding and rendering is in progress for WebP
(crbug.com/900264), we would like holistic and consistent
measurement of the performance between YUV and RGB decoding.
The YUV decoding feature is being implemented for GPU
rasterization first. Later, we will do the same for JPEG
(crbug.com/919627).

This CL replaces the existing story with four new ones:
 * WebP GPU rasterization that does not disable YUV
 * WebP GPU rasterization that disables YUV (hence is RGB)
 * JPEG GPU rasterization that does not disable YUV (is
RGB for now)
 * JPEG GPU rasterization that disables YUV (hence is RGB)
These ImageDecodingStory tests draw 10 pastel-colored squares
from hard-coded base64 data and at a relatively slow rate.

Bug: 944756
Change-Id: Id46817eb300b3c6f3681ccf331ba23f67bbdfef6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536460Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Leon Scroggins <scroggo@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Madeleine Barowsky <mbarowsky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659026}