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This change implements the delegate for the geolocation permission
context in WebLayer. In addition, it adds necessary functionality to
request Android permissions if necessary.

Still needs to be done:
- Remove FakePermissionManager which is currently being used in
  geolocation instrumentation tests.
- Make prefs persistent. Right now you have to re-allow geolocation
  permission on every restart.

Bug: 1025625, 1025609
Change-Id: I97dca79f0e1ecaa45bea1df89d126a9a244f368e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2110519
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752482}