Moves common view_manager related aura files to mojo/aura

mojo/aura/window_tree_host_mojo_delegate.h

+// Copyright 2014 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_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_DELEGATE_H_
+#define MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_DELEGATE_H_
+
+class SkBitmap;
+
+namespace mojo {
+
+class WindowTreeHostMojoDelegate {
+ public:
+  // Invoked when the contents of the composite associated with the
+  // WindowTreeHostMojo are updated.
+  virtual void CompositorContentsChanged(const SkBitmap& bitmap) = 0;
+
+ protected:
+  virtual ~WindowTreeHostMojoDelegate() {}
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_EXAMPLES_AURA_DEMO_WINDOW_TREE_HOST_VIEW_MANAGER_DELEGATE_H_