Allow specifying ColorBehavior to ImageSource
This patch has no functional change, but will allow subsequent patches
to specify a different target color space depending on their application
(e.g, canvas and WebGL can request sRGB, and raster can request
the output device behavior).
BUG=
667420
Committed:
https://crrev.com/80eae1dfec8262cb7cc2f585d85d1d41a63a1168
Cr-Commit-Position: refs/heads/master@{#437514}