Add processor name to comment when printing out shaders.

src/gpu/gl/builders/GrGLProgramBuilder.cpp

Index: src/gpu/gl/builders/GrGLProgramBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.cpp b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
index 62032f89c662b3c82c9f98c64fba6d5be41719ad..f628db9289fe44bb8641d5b5163ae5914c6c7196 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
@@ -296,7 +296,7 @@ void GrGLProgramBuilder::emitAndInstallProc(const Proc& proc,
 
     // Enclose custom code in a block to avoid namespace conflicts
     SkString openBrace;
-    openBrace.printf("{ // Stage %d\n", fStageIndex);
+    openBrace.printf("{ // Stage %d, %s\n", fStageIndex, proc.name());
     fFS.codeAppend(openBrace.c_str());
 
     this->emitAndInstallProc(proc, keyProvider.get(index), output->c_str(),