Implement SPDY4 CONTINUATION frame in SpdyFramer.

Add new continuation flags to HEADERS and PUSH_PROMISE frames for SPDY4/HTTP2.

This lands server change 62086574 by mlavan.

BUG=345769

Review URL: https://codereview.chromium.org/183983002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254526 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254526
Component build fix: indexed_db_quota_client_unittest.cc

Export GetOriginUsage(...) and DeleteOriginData(...) in IndexedDBQuotaClient to
fix undefined reference build error.

BUG=N/A

Review URL: https://codereview.chromium.org/185413011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254528 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254528