- Add MayBlock() method to stream classes which is used as a hint when determining the thread to access the stream from (issue #1187).
- In cases where MayBlock() returns true have CefStreamResourceReader perform the reads on the FILE thread (issue #1187).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1582 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Revert unintended changes from revision 1582.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1583 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Revert unintended changes from revision 1582.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1584 5089003a-bbd8-11dd-ad1f-f1f9622dbc98