Reduce integer divides in GrAllocator

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 965 matching lines @@
             fColorStageCnt = drawState.fColorStages.count();
             for (int i = 0; i < fColorStageCnt; ++i) {
                 fStages[i].saveFrom(drawState.fColorStages[i]);
             }
             for (int i = 0; i < drawState.fCoverageStages.count(); ++i) {
                 fStages[i + fColorStageCnt].saveFrom(drawState.fCoverageStages[i]);
             }
             SkDEBUGCODE(fInitialized = true;)
         }
 
-        void restoreTo(GrDrawState* drawState) {
+        void restoreTo(GrDrawState* drawState) const {
             SkASSERT(fInitialized);
             drawState->fCommon = fCommon;
             drawState->setRenderTarget(fRenderTarget);
             // reinflate color/cov stage arrays.
             drawState->fColorStages.reset();
             for (int i = 0; i < fColorStageCnt; ++i) {
                 SkNEW_APPEND_TO_TARRAY(&drawState->fColorStages, GrEffectStage, (fStages[i]));
             }
             int coverageStageCnt = fStages.count() - fColorStageCnt;
             drawState->fCoverageStages.reset();
@@ skipping 57 matching lines @@
      *  @param count      the number of attributes being set, limited to kMaxVertexAttribCnt.
      */
     void setVertexAttribs(const GrVertexAttrib attribs[], int count);
 
     typedef SkRefCnt INHERITED;
 };
 
 GR_MAKE_BITFIELD_OPS(GrDrawState::BlendOptFlags);
 
 #endif