Remove possiblity of NULL effect in GrEffectStage

src/gpu/GrDrawState.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawState_DEFINED
 #define GrDrawState_DEFINED
 
@@ skipping 1006 matching lines @@
                 fStages[i + fColorStageCnt].saveFrom(drawState.fCoverageStages[i]);
             }
             GR_DEBUGCODE(fInitialized = true;)
         }
 
         void restoreTo(GrDrawState* drawState) {
             GrAssert(fInitialized);
             drawState->fCommon = fCommon;
             drawState->setRenderTarget(fRenderTarget);
             // reinflate color/cov stage arrays.
-            drawState->fColorStages.reset(fColorStageCnt);
+            drawState->fColorStages.reset();
             for (int i = 0; i < fColorStageCnt; ++i) {
-                fStages[i].restoreTo(&drawState->fColorStages[i]);
+                SkNEW_APPEND_TO_TARRAY(&drawState->fColorStages, GrEffectStage, (fStages[i]));
             }
             int coverageStageCnt = fStages.count() - fColorStageCnt;
-            drawState->fCoverageStages.reset(coverageStageCnt);
+            drawState->fCoverageStages.reset();
             for (int i = 0; i < coverageStageCnt; ++i) {
-                fStages[fColorStageCnt + i].restoreTo(&drawState->fCoverageStages[i]);
+                SkNEW_APPEND_TO_TARRAY(&drawState->fCoverageStages,
+                                        GrEffectStage, (fStages[i + fColorStageCnt]));
             }
         }
 
         bool isEqual(const GrDrawState& state) const {
             int numCoverageStages = fStages.count() - fColorStageCnt;
             if (fRenderTarget != state.fRenderTarget.get() ||
                 fColorStageCnt != state.fColorStages.count() ||
                 numCoverageStages != state.fCoverageStages.count() ||
                 fCommon != state.fCommon) {
                 return false;
@@ skipping 44 matching lines @@
      *  @param count      the number of attributes being set, limited to kMaxVertexAttribCnt.
      */
     void setVertexAttribs(const GrVertexAttrib attribs[], int count);
 
     typedef GrRefCnt INHERITED;
 };
 
 GR_MAKE_BITFIELD_OPS(GrDrawState::BlendOptFlags);
 
 #endif