HID: Support top-level collection usages in device info.

device/hid/hid_usage_and_page.cc

Index: device/hid/hid_usage_and_page.cc
diff --git a/device/serial/serial_device_enumerator.cc b/device/hid/hid_usage_and_page.cc
similarity index 54%
copy from device/serial/serial_device_enumerator.cc
copy to device/hid/hid_usage_and_page.cc
index 586d33d8446698e51911ab9cabfc7b4738e1e042..773346b7a5b75eac628fb64fed9405c0b176fef3 100644
--- a/device/serial/serial_device_enumerator.cc
+++ b/device/hid/hid_usage_and_page.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "device/serial/serial_device_enumerator.h"
+#include "device/hid/hid_usage_and_page.h"
 
 namespace device {
 
-SerialDeviceEnumerator::SerialDeviceEnumerator() {}
-
-SerialDeviceEnumerator::~SerialDeviceEnumerator() {}
+bool HidUsageAndPage::operator==(const HidUsageAndPage& other) const {
+  return usage == other.usage && usage_page == other.usage_page;
+}
 
 }  // namespace device