Embed a mojo ApplicationManager in content/browser

content/common/process_control.mojom

Index: content/common/process_control.mojom
diff --git a/content/common/process_control.mojom b/content/common/process_control.mojom
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+// Copyright 2015 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 content;
+
+import "mojo/application/public/interfaces/application.mojom";
+
+interface ProcessControl {
+  LoadApplication(string url, mojo.Application& request) => (bool success);
+};
+