added emitChild() to GrGLFragmentProcessor; removed AutoFragmentChildProcAdvance class

src/gpu/gl/GrGLFragmentProcessor.h

Index: src/gpu/gl/GrGLFragmentProcessor.h
diff --git a/src/gpu/gl/GrGLFragmentProcessor.h b/src/gpu/gl/GrGLFragmentProcessor.h
index c7964dcc904836df52e6b99f45c36dd260e7c2fc..c46b00218fcf06dfcf3d8f318733d408ecb88072 100644
--- a/src/gpu/gl/GrGLFragmentProcessor.h
+++ b/src/gpu/gl/GrGLFragmentProcessor.h
@@ -80,6 +80,8 @@ public:
         return fChildProcessors[index];
     }
 
+    void emitChild(int childIndex, const char* inputColor, SkString* outputColor, EmitArgs& args);
+
 protected:
     /** A GrGLFragmentProcessor instance can be reused with any GrFragmentProcessor that produces
     the same stage key; this function reads data from a GrFragmentProcessor and uploads any