DM warning-free on win64

tests/Writer32Test.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 "SkRandom.h"
 #include "SkReader32.h"
 #include "SkWriter32.h"
@@ skipping 145 matching lines @@
             *ptr++ = rand.nextU();
         }
 
         // Write  the random data to the writer at different lengths for
         // different alignments.
         for (size_t len = 0; len < dataSize; len++) {
             writer->writePad(originalData.get(), len);
         }
     }
 
-    uint32_t totalBytes = writer->bytesWritten();
+    size_t totalBytes = writer->bytesWritten();
 
     SkAutoMalloc readStorage(totalBytes);
     writer->flatten(readStorage.get());
 
     SkReader32 reader;
     reader.setMemory(readStorage.get(), totalBytes);
 
     for (size_t len = 0; len < dataSize; len++) {
         const char* readPtr = static_cast<const char*>(reader.skip(len));
         // Ensure that the data read is the same as what was written.
@@ skipping 128 matching lines @@
     SkAutoDataUnref snapshot(writer.snapshotAsData());
     // check the snapshot still points to the same data as the writer
     REPORTER_ASSERT(reporter, writer.contiguousArray() == beforeData);
     REPORTER_ASSERT(reporter, snapshot->data() == beforeData);
     REPORTER_ASSERT(reporter, snapshot->size() == writer.bytesWritten());
     // write more data that would fit in the buffer
     writer.write(array, sizeof(array));
     // test it triggered COW anyway
     REPORTER_ASSERT(reporter, writer.contiguousArray() != beforeData);
 }