Enable size_t to int truncation warnings in PPAPI

ppapi/examples/printing/printing.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string.h>
 
 #include "ppapi/cpp/dev/buffer_dev.h"
 #include "ppapi/cpp/dev/printing_dev.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/instance.h"
@@ skipping 49 matching lines @@
   }
 
   virtual int32_t PrintBegin(const PP_PrintSettings_Dev& print_settings) {
     return 1;
   }
 
   virtual pp::Resource PrintPages(
       const PP_PrintPageNumberRange_Dev* page_ranges,
       uint32_t page_range_count) {
     size_t pdf_len = strlen(pdf_data);
-    pp::Buffer_Dev buffer(this, pdf_len);
+    pp::Buffer_Dev buffer(this, static_cast<uint32_t>(pdf_len));
 
     memcpy(buffer.data(), pdf_data, pdf_len);
     return buffer;
   }
 
   virtual void PrintEnd() {
   }
 
   virtual bool IsPrintScalingDisabled() {
     return true;
@@ skipping 13 matching lines @@
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp