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Allow for an AppShimHost to be created before the corresponding
AppShimHostBootstrap. Update OnAppLaunchComplete to save the launch
result and send it only once an AppShimHostBootstrap is attached.

Change ExtensionAppShimHandler profile paths to use the full path
(as is reported by the Profile object, as opposed to the shim's
message).

Change the method GetHostForBrowser to instead be
GetViewsBridgeFactoryHostForBrowser, because the ViewsBridgeFactory is
what all callers are after. Make this call trigger creation of an
AppShimHost if needed to provide a ViewsBridgeFactory. Keep this
guarded behind a flag for now.

Add tests for this functionality. In the tests, further decouple
the AppShimHostBootstrap from its AppShimHost.

Bug: 896917
Change-Id: Ib9e4ad6535ca87cd0e01303fbfc772b8892aec12
Reviewed-on: https://chromium-review.googlesource.com/c/1309307Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604440}