Include external touchscreen vid/pid in UMA hardware profile

chrome/common/metrics/proto/system_profile.proto

 // 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.
 //
 // Stores information about the user's brower and system configuration.
 // The system configuration fields are recorded once per client session.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
@@ skipping 65 matching lines @@
     optional string name = 1;
 
     // The version of the OS.  The meaning of this field is OS-dependent.
     optional string version = 2;
 
     // The fingerprint of the build.  This field is used only on Android.
     optional string fingerprint = 3;
   }
   optional OS os = 5;
 
-  // Next tag for Hardware: 14
+  // Next tag for Hardware: 16
   // Information on the user's hardware.
   message Hardware {
     // The CPU architecture (x86, PowerPC, x86_64, ...)
     optional string cpu_architecture = 1;
 
     // The amount of RAM present on the system, in megabytes.
     optional int64 system_ram_mb = 2;
 
     // The base memory address that chrome.dll was loaded at.
     // (Logged only on Windows.)
@@ skipping 115 matching lines @@
         // Product ID of the device, where available.
         optional uint32 product_id = 6;
 
         // Device ID of the device, generally the release or version number in
         // BCD format, where available.
         optional uint32 device_id = 7;
       }
       repeated PairedDevice paired_device = 3;
     }
     optional Bluetooth bluetooth = 11;
+
+    // Whether the internal display produces touch events.
+    optional bool internal_display_supports_touch = 14;
+
+    // vendor ids and product ids of external touchscreens.

[Ilya Sherman, 2013/12/14 00:12:12]

nit: Please start the comment with a capital letter.

[tdresser, 2014/01/06 15:44:46]

Done.

+    message TouchScreen {
+      optional uint32 vendor_id = 1;
+      optional uint32 product_id = 2;
+    }
+    repeated TouchScreen external_touchscreen = 15;
   }
   optional Hardware hardware = 6;
 
   // Information about the network connection.
   message Network {
     // Set to true if connection_type changed during the lifetime of the log.
     optional bool connection_type_is_ambiguous = 1;
 
     // See net::NetworkChangeNotifier::ConnectionType.
     enum ConnectionType {
@@ skipping 204 matching lines @@
     // Currently, the identifier is a hash of the group's name.
     optional fixed32 group_id = 2;
   }
   repeated FieldTrial field_trial = 9;
 
   // Number of users currently signed into a multiprofile session.
   // A zero value indicates that the user count changed while the log is open.
   // Logged only on ChromeOS.
   optional uint32 multi_profile_user_count = 17;
 }