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- Implemented the flow when user clicked notification and launch Chrome
Activity from background.

Bug: 1013685
Change-Id: Ib9e96da59358fcc9f4016cf8a5ebcfe3ec043dc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994240
Commit-Queue: Hesen Zhang <hesen@chromium.org>
Auto-Submit: Hesen Zhang <hesen@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732990}