Add BROWSABLE intent to Mandoline AndroidManifest.xml

Add BROWSABLE intent to Mandoline AndroidManifest.xml

Building mandoline/app/android:mandoline_apk yields:
ACTION //mandoline/app/android:mando...e_apk__java__lint(//build/toolchain/android:arm)
AndroidManifest.xml:27 Activity supporting ACTION_VIEW is not set as BROWSABLE: AppIndexingWarning [warning]
...

The result.xml additionally explains:
  summary="Missing App Indexing Support"
  explanation="Ensures the app can correctly handle deep links and integrate with App Indexing for Google search."

BUG=NONE
TEST=No Android build lint issues; no regressions.
R=sky@chromium.org,jcivelli@chromium.org

Committed: https://crrev.com/4f1b796f1d80bc180830321516a9d5e1581fffef
Cr-Commit-Position: refs/heads/master@{#333221}

[msw, 2015-06-05 23:54:54]

msw@chromium.org changed reviewers:
+ jcivelli@chromium.org

[msw, 2015-06-05 23:57:27]

Hey Jay, please take a look; thanks!

[sky, 2015-06-06 18:01:22]

sky@chromium.org changed reviewers:
+ sky@chromium.org

[sky, 2015-06-06 18:01:23]

LGTM

[msw, 2015-06-07 00:38:40]

The CQ bit was checked by msw@chromium.org

[commit-bot: I haz the power, 2015-06-07 00:38:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1163833004/1

[commit-bot: I haz the power, 2015-06-07 00:46:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-07 00:46:54]

Patchset 1 (id:??) landed as
https://crrev.com/4f1b796f1d80bc180830321516a9d5e1581fffef
Cr-Commit-Position: refs/heads/master@{#333221}