Added tree structure to GrGLFragmentProcessor, i.e. GL instances

src/gpu/gl/GrGLFragmentProcessor.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGLFragmentProcessor.h"
+#include "GrFragmentProcessor.h"
+
+void GrGLFragmentProcessor::setData(const GrGLProgramDataManager& pdman,
+                                    const GrFragmentProcessor& processor) {
+    this->onSetData(pdman, processor);
+    SkASSERT(fChildProcessors.count() == processor.numChildProcessors());
+    for (int i = 0; i < fChildProcessors.count(); ++i) {
+        fChildProcessors[i]->setData(pdman, processor.childProcessor(i));
+    }
+}