GitLab

This CL adds the AppLocaleController interface and the
GlobalAppLocaleController implementation which use the
APPLICATION_OVERRIDE_LANGUAGE value to override the Clank language.

Early in ChromeApplication.attachBaseContext the
GlobaleAppLocaleController singleton is initialized with the override
language and updates the Application level Locales/LocaleList.  Doing
the Application override this early also overrides the ContextUtils
wrapped application Context.

The base Context passed by Android to the Activity level
attachBaseContext still uses the system locales so an Activity level
locale override is also done.

The override language is used for CCTs.

This is the third of four CLs for this feature.  The next will
introduce the UI changes to allow users to control the preference.

Bug: 1068667
Change-Id: Ifbbe9f8ed592c1b890a9069ef5cbfb685d34e00f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354546Reviewed-by: Trevor  Perrier <perrier@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Commit-Queue: Trevor  Perrier <perrier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805882}