Add method to GrProgramResource to record that pending a execution was completed.

src/gpu/GrProgramElement.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-
 #include "GrProgramElement.h"
 #include "GrProgramResource.h"
 
 void GrProgramElement::convertRefToPendingExecution() const {
     // This function makes it so that all the GrProgramResources own a single ref to their
     // underlying GrGpuResource if there are any refs to the GrProgramElement and a single
     // pending read/write if there are any pending executions of the GrProgramElement. The
     // GrProgramResource will give up its single ref and/or pending read/write in its destructor.
     SkASSERT(fRefCnt > 0);
     if (0 == fPendingExecutions) {
         for (int i = 0; i < fProgramResources.count(); ++i) {
             fProgramResources[i]->markPendingIO();
         }
     }
     ++fPendingExecutions;
     this->unref();
     if (0 == fRefCnt) {
         for (int i = 0; i < fProgramResources.count(); ++i) {
             fProgramResources[i]->removeRef();
         }
     }
 }
+
+void GrProgramElement::completedExecution() const {
+    this->validate();
+    --fPendingExecutions;
+    if (0 == fPendingExecutions) {
+        if (0 == fRefCnt) {
+            SkDELETE(this);
+        } else {
+            // Now our pending executions have ocurred and we still have refs. Convert
+            // ownership of our resources back to regular refs.
+            for (int i = 0; i < fProgramResources.count(); ++i) {
+                fProgramResources[i]->pendingIOComplete();
+            }
+
+        }
+    }
+}