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There are two variables that determine if Chrome should render P3
content:
  * Configuration.isScreenWideColorGamut reports whether or not the
    system compositor will perform color correction for EGL surfaces
    that are tagged with a color space.
  * Display.isWideColorGamut reports whether or not this particular
    display has a wide color gamut.

The Configuration.isScreenWideColorGamut variable must be read from the
WindowAndroid's context.

Update both of these variables, and plumb their conjunction down into
the native code, where it is used to select P3 or sRGB.

This mechanism is only used by Chrome, not WebView. For WebView, add hooks
in WebContentsViewDelegate to override the color space that is passed to
the renderer (instead of just using the one from the display::Display).

R=boliu
TBR=mthiesse

Bug: 735658
Change-Id: I7781b4a1068a57a480123a58302fe484273565fd
Reviewed-on: https://chromium-review.googlesource.com/571053
Commit-Queue: ccameron chromium <ccameron@chromium.org>
Reviewed-by: Bo Liu <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487391}