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Adds a ripple definition specific to Incognito and changes where the
selectable background is applied to DecoratedSuggestionView and action
buttons.

We logically have 3 possible sources of selection colors now:
* Device light theme based
* Device dark theme based
* Incognito based (very similar to dark theme, but does not leak
  attributes).

To better manage the 3 possible states this patch introduces
OmniboxTheme with values { LIGHT_MODE, DARK_MODE, INCOGNITO }.

To better resolve attribute values for the OmniboxTheme, this patch
introduces OmniboxResourceProvider.

All changes appropriately update USE_DARK_COLORS model property to
OMNIBOX_THEME.

Bug: 1103291
Change-Id: I14f276274b25b6afa51ed7fbc3661a5437c5b1d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288074
Commit-Queue: Krishna Govind <govind@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Ender 💬 = 🕐 (ping me for faster reviews) <ender@google.com>
Reviewed-by: Lijin Shen <lazzzis@google.com>
Cr-Commit-Position: refs/heads/master@{#791375}