GitLab

Here's the set of classes/changes:

weblayer_private.BrowserControllerClient: this is a singleton that is supplied
when creating BrowserControllerImpl. It will duplicate the C++ BrowserObserver
interface along with any other server->client calls we want.

BrowserController: supplies an implementation (as an inner class) of
BrowserControllerClient to BrowserControllerImpl. BrowserController's inner
class forwards calls to BrowserObservers.

BrowserObserverProxy: there is a C++ and Java class with this name. The two
are tightly coupled. The C++ side implements BrowserObserver and forwards to the
java side. The java side forwards to BrowserControllerClient.

BUG=none
TEST=none

Change-Id: I2817149224f4ac2045769c4ce0c3f81040dc7507
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772501
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691007}