Make GrDrawState and GrEffectStage use the pending io/exec ref mechanisms.

src/gpu/GrRODrawState.h

Index: src/gpu/GrRODrawState.h
diff --git a/src/gpu/GrRODrawState.h b/src/gpu/GrRODrawState.h
index 54d87bdfc8ca111f16edff88164749c6fd653de0..92cb3b5fa8aa1a22892f939f5b9ba1402685c5b9 100644
--- a/src/gpu/GrRODrawState.h
+++ b/src/gpu/GrRODrawState.h
@@ -8,13 +8,13 @@
 #ifndef GrRODrawState_DEFINED
 #define GrRODrawState_DEFINED
 
-#include "GrStencil.h"
 #include "GrEffectStage.h"
+#include "GrRenderTarget.h"
+#include "GrStencil.h"
 #include "SkMatrix.h"
 
 class GrDrawTargetCaps;
 class GrPaint;
-class GrRenderTarget;
 class GrTexture;
 
 /**
@@ -238,7 +238,9 @@ public:
      *
      * @return    The currently set render target.
      */
-    GrRenderTarget* getRenderTarget() const { return fRenderTarget.get(); }
+    GrRenderTarget* getRenderTarget() const {
+        return static_cast<GrRenderTarget*>(fRenderTarget.getResource());
+    }
 
     /// @}
 
@@ -340,10 +342,23 @@ public:
     };
 
 protected:
+    /**
+     * Converts refs on GrGpuResources owned directly or indirectly by this GrRODrawState into
+     * pending reads and writes. This should be called when a GrDrawState is recorded into
+     * a GrDrawTarget for later execution. Subclasses of GrRODrawState may add setters. However,
+     * once this call has been made the GrRODrawState is immutable. It is also no longer copyable.
+     * In the future this conversion will automatically happen when converting a GrDrawState into
+     * an optimized draw state.
+     */
+    void convertToPendingExec();
+
+    friend class GrDrawTarget;
+
+protected:
     bool isEqual(const GrRODrawState& that) const;
 
     // These fields are roughly sorted by decreasing likelihood of being different in op==
-    SkAutoTUnref<GrRenderTarget>        fRenderTarget;
+    GrProgramResource                   fRenderTarget;
     GrColor                             fColor;
     SkMatrix                            fViewMatrix;
     GrColor                             fBlendConstant;