Log device/hid messages to chrome://device-log.

components/device_event_log/device_event_log_impl.cc

Index: components/device_event_log/device_event_log_impl.cc
diff --git a/components/device_event_log/device_event_log_impl.cc b/components/device_event_log/device_event_log_impl.cc
index 766ed16c73397ab20c201816565996248d5b5f6f..3d7b8862b49eb2480a09f6e9bc7da77946f27a5f 100644
--- a/components/device_event_log/device_event_log_impl.cc
+++ b/components/device_event_log/device_event_log_impl.cc
@@ -30,6 +30,7 @@ const char* kLogTypeNetworkDesc = "Network";
 const char* kLogTypePowerDesc = "Power";
 const char* kLogTypeLoginDesc = "Login";
 const char* kLogTypeUsbDesc = "USB";
+const char* kLogTypeHidDesc = "HID";
 
 std::string GetLogTypeString(LogType type) {
   switch (type) {
@@ -41,6 +42,8 @@ std::string GetLogTypeString(LogType type) {
       return kLogTypeLoginDesc;
     case LOG_TYPE_USB:
       return kLogTypeUsbDesc;
+    case LOG_TYPE_HID:
+      return kLogTypeHidDesc;
     default:
       NOTREACHED();
       return "Unknown";