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Add espresso tests for HomeFragment to test:
- Correct info is shown when the app is launched from the current
  WebView provider and when it's not.
- Long press on the items copy the correct info to clipboard.

Bug: 1106300
Test: out/Debug86/bin/run_webview_instrumentation_test_apk -f "*android_webview.devui*"
Change-Id: I63bab2647e65b758e4b14838d1ba34edd54a064a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352738
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800128}