Added mangleString member and onBefore*, onAfter* functions to GrGLFragmentShaderBuilder

src/gpu/GrProcessor.cpp

Index: src/gpu/GrProcessor.cpp
diff --git a/src/gpu/GrProcessor.cpp b/src/gpu/GrProcessor.cpp
index 6cc2a20d719b4c2b69e0064e1cc7e681beb6ffc5..39c55a60e4d12ed26f11eacd861dc502f3ecf56b 100644
--- a/src/gpu/GrProcessor.cpp
+++ b/src/gpu/GrProcessor.cpp
@@ -150,8 +150,9 @@ int GrFragmentProcessor::registerChildProcessor(const GrFragmentProcessor* child
     int index = fChildProcessors.count();
     fChildProcessors.push_back(GrFragmentStage(child));
 
-    if (child->willReadFragmentPosition())
+    if (child->willReadFragmentPosition()) {
         this->setWillReadFragmentPosition();
+    }
 
     return index;
 }