GitLab

This CL updates the ShellAPK (but not Chrome) to support POST share targets. In particular, this
CL:
- Adds needed <meta-data> tags to AndroidManifest.xml
- Updates how the start URL is computed for share intents
- Sends activity class name of selected share target to Chrome in launch intent. Chrome needs
  this to know which share target activity to read the <meta-data> from.

BUG=885314

Change-Id: Ie8732a8477d722ebdb81595c602b289fab0c7a27
Reviewed-on: https://chromium-review.googlesource.com/c/1281691
Commit-Queue: Ethan Xu <xuethan@google.com>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Glenn Hartmann <hartmanng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601686}