Fix several leaks in the Sky compositor

mojo/gpu/gl_context_owner.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_GPU_GL_CONTEXT_OWNER_H_
+#define MOJO_GPU_GL_CONTEXT_OWNER_H_
+
+#include "base/memory/weak_ptr.h"
+
+namespace mojo {
+class GLContext;
+class Shell;
+
+class GLContextOwner {
+ public:
+  explicit GLContextOwner(mojo::Shell* shell);
+  ~GLContextOwner();
+
+  const base::WeakPtr<mojo::GLContext>& context() const {
+    return context_;
+  }
+
+ private:
+  base::WeakPtr<mojo::GLContext> context_;
+
+  DISALLOW_COPY_AND_ASSIGN(GLContextOwner);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_GPU_GL_CONTEXT_OWNER_H_