arc: IPC method to set custom wallpaper.

components/arc/common/intent_helper.mojom

Index: components/arc/common/intent_helper.mojom
diff --git a/components/arc/common/intent_helper.mojom b/components/arc/common/intent_helper.mojom
index 5c5bc12c8551f21117a23784734d743456ec7d68..2f44bf5a718f9a34495d4ef940b443997910d005 100644
--- a/components/arc/common/intent_helper.mojom
+++ b/components/arc/common/intent_helper.mojom
@@ -1,6 +1,8 @@
 // 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.
+//
+// Next MinVersion: 8
 
 module arc.mojom;
 
@@ -43,6 +45,7 @@ struct UrlWithMimeType {
 };
 
 // Handles intents from ARC in Chrome.
+// Next method ID: 5
 interface IntentHelperHost {
   // Called when icons associated with the package are no longer up to date.
   [MinVersion=3] OnIconInvalidated@1(string package_name);
@@ -55,9 +58,14 @@ interface IntentHelperHost {
 
   // Opens the wallpaper picker dialog.
   [MinVersion=6] OpenWallpaperPicker@3();
+
+  // Sets an image as the wallpaper.
+  // |jpeg_data| is a JPEG encoded wallpaper image.
+  [MinVersion=7] SetWallpaper@4(array<uint8> jpeg_data);
 };
 
 // Sends intents to ARC on behalf of Chrome.
+// Next method ID: 8
 interface IntentHelperInstance {
   // Handles the URL by sending an ACTION_VIEW intent to the package. The
   // most suitable activity for the URL within the package will be started.