Added runtime flag for Gamepad Extensions

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 589804776dd8c3aa3585accdc7d01b9ff1e8d8f4..caa2940f7d21553a6bbd25c84184fde86f120ee6 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5630,6 +5630,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_WEBVR_DESCRIPTION" desc="Description for the flag to enable WebVR APIs.">
         Enabling this option allows web applications to access experimental Virtual Reality APIs.
       </message>
+      <message name="IDS_FLAGS_GAMEPAD_EXTENSIONS_NAME" desc="Name of the 'Enable Gamepad Extensions' flag.">

[jochen (gone - plz use gerrit), 2016/09/02 12:29:31]

please make the description more verbose, so translators that just see the desc
string have a chance to know what you'r talking about.

something like name of the flag that users can enable to expose extensions to
the API that allows websites to access gamepads connect to the computer

+        Gamepad Extensions
+      </message>
+      <message name="IDS_FLAGS_GAMEPAD_EXTENSIONS_DESCRIPTION" desc="Description for the flag to enable Gamepad Extensions.">

[jochen (gone - plz use gerrit), 2016/09/02 12:29:31]

same here

+        Enabling this option allows web applications to access experimental extensions to the Gamepad APIs.
+      </message>
       <if expr="is_android">
         <message name="IDS_FLAGS_ENABLE_OSK_OVERSCROLL_NAME" desc="Name of about:flags option to turn on the overscrolling for the OSK.">
           Enable OSK Overscroll