Create GrOptDrawState before recording draw in GrInOrderDrawBuffer

src/gpu/GrPendingProgramElement.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrPendingProgramElement_DEFINED
+#define GrPendingProgramElement_DEFINED
+
+#include "SkRefCnt.h"
+#include "GrTypes.h"
+
+/**
+ * Helper for owning a pending execution on a GrProgramElement. Using this rather than ref allows
+ * resources that are owned by the program element to be correctly tracked as having pending reads
+ * and writes rather than refs.
+ */
+template <typename T> class GrPendingProgramElement : SkNoncopyable {
+public:
+    GrPendingProgramElement() : fObj(NULL) { };
+
+    // Adds a pending execution on obj.
+    explicit GrPendingProgramElement(T* obj) : fObj(obj)  {
+        if (obj) {
+            obj->addPendingExecution();
+        }
+    }
+
+    void reset(T* obj) {
+        if (obj) {
+            obj->addPendingExecution();
+        }
+        if (fObj) {
+            fObj->completedExecution();
+        }
+        fObj = obj;
+    }
+
+    void convertToPendingExec() {
+        SkASSERT(!fOwnPendingExec);
+        fObj->convertRefToPendingExecution();
+        fOwnPendingExec = true;
+    }
+
+    T* get() const { return fObj; }
+    operator T*() { return fObj; }
+
+    T *operator->() const {
+        return static_cast<BlockRefType*>(fObj);
+    }
+
+    ~GrPendingProgramElement() {
+        if (fObj) {
+            fObj->completedExecution();
+        }
+    }
+
+private:
+    T*   fObj;
+
+    typedef SkNoncopyable INHERITED;
+};
+#endif