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With cc: Add solid color analyzer to replace AnalysisCanvas,
https://chromium-review.googlesource.com/c/chromium/src/+/538974/

Solid color analysis is run directly on a paint op buffer instead of
rasterizing to a skia::AnalysisCanvas. This change hence removes
stale comment that refers to optimizing AnalysisCanvas.

Change-Id: Ic87d6e056596713b85882abadbd278bf866ab3dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860675Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705864}