Add GrEllipseEdgeEffect

src/gpu/GrEffect.cpp

Index: src/gpu/GrEffect.cpp
===================================================================
--- src/gpu/GrEffect.cpp	(revision 8091)
+++ src/gpu/GrEffect.cpp	(working copy)
@@ -90,6 +90,11 @@
     fTextureAccesses.push_back(access);
 }
 
+void GrEffect::addVertexAttrib(GrSLType type) {
+    GrAssert(fVertexAttribTypes.count() < kMaxVertexAttribs);
+    fVertexAttribTypes.push_back(type);
+}
+
 void* GrEffect::operator new(size_t size) {
     return GrEffect_Globals::GetTLS()->allocate(size);
 }