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

src/gpu/GrProcessor.cpp

Index: src/gpu/GrProcessor.cpp
diff --git a/src/gpu/GrProcessor.cpp b/src/gpu/GrProcessor.cpp
index 3090d0f461016391e6e5429fe06792f25c977a57..0eaab75b61b3028d3981b933c6e63b5198fb5795 100644
--- a/src/gpu/GrProcessor.cpp
+++ b/src/gpu/GrProcessor.cpp
@@ -13,6 +13,7 @@
 #include "GrMemoryPool.h"
 #include "GrXferProcessor.h"
 #include "SkSpinlock.h"
+#include "gl/GrGLFragmentProcessor.h"
 
 #if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
 
@@ -156,6 +157,15 @@ bool GrFragmentProcessor::isEqual(const GrFragmentProcessor& that,
     return true;
 }
 
+GrGLFragmentProcessor* GrFragmentProcessor::createGLInstance() const {
+    GrGLFragmentProcessor* glFragProc = this->onCreateGLInstance();
+    glFragProc->fChildProcessors.push_back_n(fChildProcessors.count());
+    for (int i = 0; i < fChildProcessors.count(); ++i) {
+        glFragProc->fChildProcessors[i] = fChildProcessors[i].processor()->createGLInstance();
+    }
+    return glFragProc;
+}
+
 void GrFragmentProcessor::addCoordTransform(const GrCoordTransform* transform) {
     fCoordTransforms.push_back(transform);
     fUsesLocalCoords = fUsesLocalCoords || transform->sourceCoords() == kLocal_GrCoordSet;