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The previous implementation of key retrieval notification on Android
didn't notify TrustedVaultClient about changed keys upon completion.

In order to detect completion of key retrieval pending intent, this CL
adds TrustedVaultKeyRetrievalProxyActivity that just launches the real
key retrieval pending intent, detects its completion and notifies
TrustedVaultClient about changed keys. This activity doesn't require
the Chrome browser process to be running when the user taps on
notification.

In order to avoid too many pending intents being created for this
notification it's not allowed to create a new notification if one is
already exists or being created.

To ensure that newest real pending intent used for new notification,
this CL also populates FLAG_UPDATE_CURRENT into PendingIntentProvider
for Sync notifications.

Bug: 1071377
Change-Id: Ibba3c9f02aa0bd233c128d98aa194f781a49d339
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2179547
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770770}