Implement the gamepad API in the IPC proxy

ppapi/shared_impl/ppapi_permissions.h

Index: ppapi/shared_impl/ppapi_permissions.h
diff --git a/ppapi/shared_impl/ppapi_permissions.h b/ppapi/shared_impl/ppapi_permissions.h
index 94db0e632a927cb04a5ec32a14d5104e981f3353..4b1c6a6a6448b4a30f64c21bf193eb6b08da7b3e 100644
--- a/ppapi/shared_impl/ppapi_permissions.h
+++ b/ppapi/shared_impl/ppapi_permissions.h
@@ -20,6 +20,8 @@ enum Permission {
   // Allows ability to bypass user-gesture checks for showing things like
   // file select dialogs.
   PERMISSION_BYPASS_USER_GESTURE = 1 << 3
+
+  // NOTE: If you add stuff be sure to update AllPermissions().
 };
 
 class PPAPI_SHARED_EXPORT PpapiPermissions {
@@ -32,6 +34,10 @@ class PPAPI_SHARED_EXPORT PpapiPermissions {
 
   ~PpapiPermissions();
 
+  // Returns a permissions class with all features enabled. This is for testing
+  // and manually registered plugins.
+  static PpapiPermissions AllPermissions();
+
   bool HasPermission(Permission perm) const;
 
  private: