[misc-sanity] Fix XWALK-1311 by removing DnD from Android tests
Merge pull request #135 from haoxli/haoxli/misc-sanity/fix-xwalk-1311

[misc-sanity] Fix XWALK-1311 by removing DnD from Android tests
[webapi] Add -manual to pagevisibility tests
[webapi] Add -manual to presentation tests
[webapi] Sync Canvas tests with latest W3C web-platform-tests