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This CL makes WebApkUpdateManager store the "WebAPK update request" to disk and
retrieve it from disk once the WebApkActivity is ready to do the update (Once
the WebApkActivity is in the background). This CL is in preparation for
https://codereview.chromium.org/2948713002/ The "WebAPK update request" cannot
be encoded as an extra on com.google.android.gms.gcm.Task#setExtras() because
GCMNetworkManager limits the total size of the extras to 10KB. We might send up
to two PNG images as part of an update request

BUG=713655

Change-Id: I9d86eb8ffe4f650340028ec6c4d12a7b8ddc1aec
Reviewed-on: https://chromium-review.googlesource.com/581231
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506451}