Include external touchscreen vid/pid in UMA hardware profile

chrome/common/metrics/proto/system_profile.proto

Index: chrome/common/metrics/proto/system_profile.proto
diff --git a/chrome/common/metrics/proto/system_profile.proto b/chrome/common/metrics/proto/system_profile.proto
index abeea2bb0f269a0cffb5d528b80a890ce25bf025..5e5296fbbe943dd4782ab30af6d012abf87c72d8 100644
--- a/chrome/common/metrics/proto/system_profile.proto
+++ b/chrome/common/metrics/proto/system_profile.proto
@@ -83,7 +83,7 @@ message SystemProfileProto {
   }
   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, ...)
@@ -219,6 +219,19 @@ message SystemProfileProto {
       repeated PairedDevice paired_device = 3;
     }
     optional Bluetooth bluetooth = 11;
+
+    // Whether the internal display produces touch events.

[Alexei Svitkine (slow), 2014/02/04 21:13:35]

Expand comment to mention that if this is omitted if the value is unknown. Also,
both this comment and the comments below should mention that this is only
recorded on ChromeOS.

[tdresser, 2014/02/04 22:01:49]

Done. I'll land the google3 side of this change once this has landed.

+    optional bool internal_display_supports_touch = 14;
+
+    // Vendor ids and product ids of external touchscreens.
+    message TouchScreen {
+      // Touch screen vendor id.
+      optional uint32 vendor_id = 1;
+      // Touch screen product id.
+      optional uint32 product_id = 2;
+    }
+    // Lists vendor and product ids of external touchscreens.
+    repeated TouchScreen external_touchscreen = 15;
   }
   optional Hardware hardware = 6;