HID API frontend for Apps.

This issue is a continuation of https://codereview.chromium.org/145653003/ with some cleanup to reflect conventions adopted by other I/O APIs.

BUG=290428

Review URL: https://codereview.chromium.org/149163006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248366 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_function_histogram_value.h b/chrome/browser/extensions/extension_function_histogram_value.h
index 6108df89..0443c08 100644
--- a/chrome/browser/extensions/extension_function_histogram_value.h
+++ b/chrome/browser/extensions/extension_function_histogram_value.h
@@ -730,6 +730,13 @@
   FILEBROWSERPRIVATE_GETPROFILES,
   FILEBROWSERPRIVATE_VISITDESKTOP,
   VIRTUALKEYBOARDPRIVATE_GETKEYBOARDCONFIG,
+  HID_GETDEVICES,
+  HID_CONNECT,
+  HID_DISCONNECT,
+  HID_RECEIVE,
+  HID_SEND,
+  HID_RECEIVEFEATUREREPORT,
+  HID_SENDFEATUREREPORT,
   ENUM_BOUNDARY // Last entry: Add new entries above.
 };