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

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 if there are any pending executions of the GrProgramElement. The
     // GrProgramResource will give up its single ref and/or pending read in its destructor.
     SkASSERT(fRefCnt > 0);
     if (0 == fPendingExecutions) {
@@ skipping 19 matching lines @@
         } 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();
             }
 
         }
     }
 }