Merge video and audio tests from Google submission
Removed duplicates from old-tests/submission/Google
add missing tests from old-tests/submission/Google
Finalize Google tests migration
Fix issues listed at https://critic.hoppipolla.co.uk/r/354
use assert_idl_attribute to check method existence
remove unneeded assertions
minimize timeout value
fix test on preload empty value
update assertions
Merge pull request #368 from w3c/deniak/google-old-tests

Deniak/google old tests