Enable size_t to int truncation warnings in PPAPI

ppapi/examples/gamepad/gamepad.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 <algorithm>
 #include <cmath>
 #include <stdarg.h>
 #include <stdio.h>
 
 #include "ppapi/c/ppb_gamepad.h"
@@ skipping 90 matching lines @@
             gamepad_data.items[0].axes[i + 0] * width2 + width2);
         int y = static_cast<int>(
             gamepad_data.items[0].axes[i + 1] * height2 + height2);
         uint32_t box_bgra = 0x80000000;  // Alpha 50%.
         FillRect(&image, x - 3, y - 3, 7, 7, box_bgra);
       }
 
       for (size_t i = 0; i < gamepad_data.items[0].buttons_length; ++i) {
         float button_val = gamepad_data.items[0].buttons[i];
         uint32_t colour = static_cast<uint32_t>((button_val * 192) + 63) << 24;
-        int x = i * 8 + 10;
+        int x = static_cast<int>(i) * 8 + 10;
         int y = 10;
         FillRect(&image, x - 3, y - 3, 7, 7, colour);
       }
     }
     return image;
   }
 
   int width_;
   int height_;
 
@@ skipping 19 matching lines @@
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   return new MyModule();
 }
 
 }  // namespace pp