Fix type truncation warnings in HID code.

device/hid/hid_service_mac.cc

 // Copyright 2014 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 "device/hid/hid_service_mac.h"
 
 #include <CoreFoundation/CoreFoundation.h>
 #include <IOKit/hid/IOHIDDevice.h>
 
 #include <set>
@@ skipping 88 matching lines @@
   CFIndex collectionsCount = CFArrayGetCount(collections);
   *has_report_id = false;
   for (CFIndex i = 0; i < collectionsCount; i++) {
     const IOHIDElementRef collection = static_cast<IOHIDElementRef>(
         const_cast<void*>(CFArrayGetValueAtIndex(collections, i)));
     // Top-Level Collection has no parent
     if (IOHIDElementGetParent(collection) == 0) {
       HidCollectionInfo collection_info;
       HidUsageAndPage::Page page = static_cast<HidUsageAndPage::Page>(
           IOHIDElementGetUsagePage(collection));
-      uint16_t usage = IOHIDElementGetUsage(collection);
-      collection_info.usage = HidUsageAndPage(usage, page);
+      uint32_t usage = IOHIDElementGetUsage(collection);
+      if (usage > std::numeric_limits<uint16_t>::max())
+        continue;
+      collection_info.usage =
+          HidUsageAndPage(static_cast<uint16_t>(usage), page);
       // Explore children recursively and retrieve their report IDs
       GetReportIds(collection, &collection_info.report_ids);
       if (collection_info.report_ids.size() > 0) {
         *has_report_id = true;
       }
       top_level_collections->push_back(collection_info);
     }
   }
 }
 
@@ skipping 170 matching lines @@
   }
 
   task_runner_->PostTask(
       FROM_HERE,
       base::Bind(callback,
                  make_scoped_refptr(new HidConnectionMac(
                      hid_device.release(), device_info, file_task_runner_))));
 }
 
 }  // namespace device