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Create a views_bridge_mac::mojom::BridgedFactory interface to create
remote views_bridge_mac::mojom::BridgedNativeWidget instances. The
chrome::mojom::AppShim interface will be updated in a follow-on patch
to have a method to provide a BridgedFactory instance.

Create a views_bridge_mac::mojom::BridgeFactoryImpl to instantiate
in the app shim process, to own the bridges.

Add a CreateWindow method to views_bridge_mac::mojom::BridgedFactory
to create a window in the app shim process. This function is not yet
expressive enough to encompass all window types needed, but is
sufficient for testing.

Add a BridgedNativeWidgetHostImpl::CreateRemoteBridge function to
create a remote bridge.

Bug: 859152
Change-Id: Iea81da4af7f3787f70474f49ba45c1c831d2fcc3
Reviewed-on: https://chromium-review.googlesource.com/1226251
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591920}