PPAPI: Make output protection API work with mus+ash

services/ui/public/interfaces/display/display_controller.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module display.mojom;
 
 import "ui/gfx/geometry/mojo/geometry.mojom";
 
 // An interface for clients that are allowed to make changes to the display 
 // state.
@@ skipping 34 matching lines @@
 
   // Sets the display work area with the provided insets. The display size is
   // included to ensure that the insets are for the current display size.
   SetDisplayWorkArea(int64 display_id, 
                      gfx.mojom.Size size,
                      gfx.mojom.Insets insets);
 
   // TODO(kylechar): This interface will need to be expanded to provide
   // additional functionality for the display settings page and other ash
   // keyboard accelerators.
+
+  // ========================= Content Protection ==============================
+
+  // Registers a client for display protection and requests a client id. Returns
+  // 0 if requesting failed.
+  [Sync]
+  RegisterContentProtectionClient() => (uint64 client_id);

[kcwu, 2017/02/07 01:35:45]

client_id is int64 or uint64? this is inconsistent.

[Peng, 2017/02/07 15:12:59]

Done.

+
+  // Unregisters the client.
+  UnregisterContentProtectionClient(int64 client_id);
+
+  // Queries link status and protection status.
+  QueryContentProtectionStatus(int64 client_id,
+                               int64 display_id) => (bool success,
+                                                     uint32 link_mask,
+                                                     uint32 protection_mask);
+
+  // Requests the desired protection methods.
+  // |protection_mask| is the desired protection methods, which is a bitmask
+  // of the ContentProtectionMethod values.
+  // Returns true when the protection request has been made.
+  EnableContentProtection(int64 client_id,
+                          int64 display_id,
+                          uint32 desired_method_mask) => (bool success);
 };