Start cleaning up 64bit Win warnings

src/gpu/GrDrawState.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawState.h"
 #include "GrPaint.h"
 
@@ skipping 385 matching lines @@
     return kNone_BlendOpt;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 void GrDrawState::AutoViewMatrixRestore::restore() {
     if (NULL != fDrawState) {
         SkDEBUGCODE(--fDrawState->fBlockEffectRemovalCnt;)
         fDrawState->fCommon.fViewMatrix = fViewMatrix;
         SkASSERT(fDrawState->numColorStages() >= fNumColorStages);
-        int numCoverageStages = fSavedCoordChanges.count() - fNumColorStages;
+        int numCoverageStages = int(fSavedCoordChanges.count()) - fNumColorStages;
         SkASSERT(fDrawState->numCoverageStages() >= numCoverageStages);
 
         int i = 0;
         for (int s = 0; s < fNumColorStages; ++s, ++i) {
             fDrawState->fColorStages[s].restoreCoordChange(fSavedCoordChanges[i]);
         }
         for (int s = 0; s < numCoverageStages; ++s, ++i) {
             fDrawState->fCoverageStages[s].restoreCoordChange(fSavedCoordChanges[i]);
         }
         fDrawState = NULL;
@@ skipping 58 matching lines @@
         fDrawState->fColorStages[s].saveCoordChange(&fSavedCoordChanges[i]);
         fDrawState->fColorStages[s].localCoordChange(coordChangeMatrix);
     }
 
     int numCoverageStages = fDrawState->numCoverageStages();
     for (int s = 0; s < numCoverageStages; ++s, ++i) {
         fDrawState->fCoverageStages[s].saveCoordChange(&fSavedCoordChanges[i]);
         fDrawState->fCoverageStages[s].localCoordChange(coordChangeMatrix);
     }
 }