Start cleaning up 64bit Win warnings

src/utils/win/SkWGL_win.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkWGL.h"
 
 #include "SkTDArray.h"
 #include "SkTSearch.h"
 #include "SkTSort.h"
 
 bool SkWGLExtensions::hasExtension(HDC dc, const char* ext) const {
     if (NULL == this->fGetExtensionsString) {
         return false;
     }
     if (!strcmp("WGL_ARB_extensions_string", ext)) {
         return true;
     }
     const char* extensionString = this->getExtensionsString(dc);
-    int extLength = strlen(ext);
+    size_t extLength = strlen(ext);
 
     while (true) {
-        int n = strcspn(extensionString, " ");
+        size_t n = strcspn(extensionString, " ");
         if (n == extLength && 0 == strncmp(ext, extensionString, n)) {
             return true;
         }
         if (0 == extensionString[n]) {
             return false;
         }
         extensionString += n+1;
     }
 
     return false;
@@ skipping 296 matching lines @@
     }
 
     if (NULL == glrc) {
         glrc = wglCreateContext(dc);
     }
     SkASSERT(glrc);
 
     wglMakeCurrent(prevDC, prevGLRC);
     return glrc;
 }