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: https://angleproject.googlecode.com/svn/trunk@762 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/Context.cpp b/src/libGLESv2/Context.cpp
index f34efcb..bd975a2 100644
--- a/src/libGLESv2/Context.cpp
+++ b/src/libGLESv2/Context.cpp
@@ -2529,6 +2529,7 @@
             device->SetPixelShader(NULL);
             device->SetVertexShader(NULL);
             device->SetFVF(D3DFVF_XYZRHW | D3DFVF_DIFFUSE);
+            device->SetStreamSource(0, NULL, 0, 0);
             device->SetRenderState(D3DRS_SEPARATEALPHABLENDENABLE, TRUE);
             device->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_SELECTARG1);
             device->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TFACTOR);