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This CL enables usage of the Sync FakeServer in Android tests. This is
done by creating a new ChromeShell-based APK, ChromeSyncShell, and a
test APK that instruments it (ChromeSyncShellTest).

As part of this CL, previously-disabled tests (SyncTest.java) are
re-enabled. However, these tests will not run as part of the Chromium
waterfall/trybots as they are not configured to run ChromeSyncShellTest.

How to run the tests:
1) Build these targets:
   chrome_sync_shell_apk
   chrome_sync_shell_test_apk

2) Run test script
   build/android/adb_install_apk.py \
   --apk=ChromeSyncShell.apk && \
   build/android/test_runner.py instrumentation \
   --test-apk ChromeSyncShellTest

BUG=323265,348951,348117
TBR=cpu@chromium.org

Review URL: https://codereview.chromium.org/457883002

Cr-Commit-Position: refs/heads/master@{#291190}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291190 0039d316-1c4b-4281-b951-d872f2087c98