Break dependency of native_viewport_service on mojo::shell::Context

mojo/services/native_viewport/native_viewport_context.h

+// Copyright 2013 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.
+
+#ifndef MOJO_SERVICES_NATIVE_VIEWPORT_CONTEXT_H_
+#define MOJO_SERVICES_NATIVE_VIEWPORT_CONTEXT_H_
+
+#include "build/build_config.h"
+
+#if defined(OS_ANDROID)
+#include "base/android/scoped_java_ref.h"
+#endif  // defined(OS_ANDROID)
+
+namespace mojo {
+namespace services {
+
+// Class used by native_viewport to provide the activity (on Android).
+class NativeViewportContext {
+ public:
+#if defined(OS_ANDROID)
+  virtual jobject GetActivity() = 0;
+#endif  // defined(OS_ANDROID)
+};
+
+}  // namespace services
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_NATIVE_VIEWPORT_CONTEXT_H_