fix more 64bit warnings

gm/getpostextpath.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 "gm.h"
 #include "SkCanvas.h"
 #include "SkPaint.h"
@@ skipping 15 matching lines @@
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setColor(SK_ColorRED);
         paint.setStyle(SkPaint::kStroke_Style);
         canvas->drawPath(path, paint);
     }
 
     virtual void onDraw(SkCanvas* canvas) {
         // explicitly add spaces, to test a prev. bug
         const char* text = "Ham bur ge fons";
-        size_t len = strlen(text);
+        int len = SkToInt(strlen(text));
         SkPath path;
 
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setTextSize(SkIntToScalar(48));
 
         canvas->translate(SkIntToScalar(10), SkIntToScalar(64));
 
         canvas->drawText(text, len, 0, 0, paint);
         paint.getTextPath(text, len, 0, 0, &path);
         strokePath(canvas, path);
         path.reset();
 
         SkAutoTArray<SkPoint>  pos(len);
         SkAutoTArray<SkScalar> widths(len);
         paint.getTextWidths(text, len, &widths[0]);
 
         SkLCGRandom rand;
         SkScalar x = SkIntToScalar(20);
         SkScalar y = SkIntToScalar(100);
-        for (size_t i = 0; i < len; ++i) {
+        for (int i = 0; i < len; ++i) {
             pos[i].set(x, y + rand.nextSScalar1() * 24);
             x += widths[i];
         }
 
         canvas->translate(0, SkIntToScalar(64));
 
         canvas->drawPosText(text, len, &pos[0], paint);
         paint.getPosTextPath(text, len, &pos[0], &path);
         strokePath(canvas, path);
     }
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* F(void*) { return new GetPosTextPathGM; }
 static skiagm::GMRegistry gR(F);