Added registerChild; transforms, textures, glKey automatically handled.

src/effects/gradients/SkLinearGradient.cpp

Index: src/effects/gradients/SkLinearGradient.cpp
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index f6b6f6a9b52bb5cfabc858ef0fd46fdeef1e4538..7ca1b604209c61735c0a0fbc6b0999d8c5cf18dd 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -495,11 +495,6 @@ public:
 
     const char* name() const override { return "Linear Gradient"; }
 
-    virtual void getGLProcessorKey(const GrGLSLCaps& caps,
-                                   GrProcessorKeyBuilder* b) const override {
-        GrGLLinearGradient::GenKey(*this, caps, b);
-    }
-
     GrGLFragmentProcessor* createGLInstance() const override {
         return SkNEW_ARGS(GrGLLinearGradient, (*this));
     }
@@ -513,6 +508,12 @@ private:
         : INHERITED(ctx, procDataManager, shader, matrix, tm) {
         this->initClassID<GrLinearGradient>();
     }
+
+    virtual void onGetGLProcessorKey(const GrGLSLCaps& caps,
+                                     GrProcessorKeyBuilder* b) const override {
+        GrGLLinearGradient::GenKey(*this, caps, b);
+    }
+
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrGradientEffect INHERITED;