DM warning-free on win64

tests/PDFPrimitivesTest.cpp

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
@@ skipping 40 matching lines @@
     SkAutoDataUnref data(stream.copyToData());
     if (offset + len > data->size()) {
         return false;
     }
     return memcmp(data->bytes() + offset, buffer, len) == 0;
 }
 
 static bool stream_contains(const SkDynamicMemoryWStream& stream,
                             const char* buffer) {
     SkAutoDataUnref data(stream.copyToData());
-    int len = strlen(buffer);  // our buffer does not have EOSs.
+    size_t len = strlen(buffer);  // our buffer does not have EOSs.
 
-    for (int offset = 0 ; offset < (int)data->size() - len; offset++) {
+    for (size_t offset = 0 ; offset < data->size() - len; offset++) {
         if (memcmp(data->bytes() + offset, buffer, len) == 0) {
             return true;
         }
     }
 
     return false;
 }
 
 static void CheckObjectOutput(skiatest::Reporter* reporter, SkPDFObject* obj,
                               const char* expectedData, size_t expectedSize,
@@ skipping 394 matching lines @@
 
     // Filter just created; should be unvisited.
     REPORTER_ASSERT(reporter, !filter->visited());
     SkPaint paint;
     paint.setImageFilter(filter.get());
     canvas.drawRect(SkRect::MakeWH(100, 100), paint);
 
     // Filter was used in rendering; should be visited.
     REPORTER_ASSERT(reporter, filter->visited());
 }