Add support for extension EXT_draw_buffers.
Review URL: https://codereview.appspot.com/7308107

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1963 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/compiler/Initialize.cpp b/src/compiler/Initialize.cpp
index 3e94ce7..97b46f8 100644
--- a/src/compiler/Initialize.cpp
+++ b/src/compiler/Initialize.cpp
@@ -654,4 +654,6 @@
         extBehavior["GL_OES_EGL_image_external"] = EBhUndefined;
     if (resources.ARB_texture_rectangle)
         extBehavior["GL_ARB_texture_rectangle"] = EBhUndefined;
+    if (resources.EXT_draw_buffers)
+        extBehavior["GL_EXT_draw_buffers"] = EBhUndefined;
 }