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This test was not possible in EG1 as EG1 can't detect system views
(in this case the activity view).

- Test that open in bar appears when a PDF is opened and test that
  interacting with it will show the activityView. Also test that after
  dismiss the activity view tapping on the web view will bring back
  the open in bar.

- This CL also include a fix for the path problem where the default
  EmbededTestServer uses the Runner.app directory as the root directory.
  Instead change that to use the bundle path in the server initialization
  inside ChromeTestCase (This is a variation of Eugenebut@ solution created
  on https://chromium-review.googlesource.com/c/chromium/src/+/1650271 )

Bug: 945461

Change-Id: Ie8b53a7b662412b6516d8f2c654a19ac657416da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1650613
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668502}