Save stream source 0 in stateblock when doing masked color clear.

BUG=214
TEST=webgl conformance tests

Review URL: http://codereview.appspot.com/5085046

git-svn-id: http://angleproject.googlecode.com/svn/trunk@762 736b8ea6-26fd-11df-bfd4-992fa37f6226
2 files changed