Made the following changes to enable merge mode

- only set EnableWebViewSynchronousAPIs in unmerge mode
- Allow wait in UI thread
- Disable 8 unit tests since SW renderer didn't work.


BUG=235702, 239144, 238735

Review URL: https://chromiumcodereview.appspot.com/13907007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@199128 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed