[Android] Crosswalk Sample code

This is the initial version of Crosswalk Sample app.
It uses Crosswalk Embedding API, and covers below API usage:
1. XWalkView UI Inflation
2. Multiple XWalkView instances
3. Manifest
4. XWalkResourceClient and XWalkUIClient
5. Preferences
6. Page Navigation
7. Pause/resume JavaScript Timers
8. Visibility Change

BUG=XWALK-1230
Merge pull request #1846 from kurli/embedded-api-sample-code

[Android] Crosswalk Sample code
[Android] Add xwalk_core_sample_apk to xwalk_builder

This is the first step to package CrosswalkSample.apk into crosswalk daily release.

BUG=XWALK-1324
Bump version to 6.35.129.0
Merge pull request #1873 from kurli/package-crosswalk-sample

[Android] Add xwalk_core_sample_apk to xwalk_builder