Add BlimpContents[,Observer] and BlimpNavigationController

blimp/client/core/blimp_contents_impl.h

Index: blimp/client/core/blimp_contents_impl.h
diff --git a/blimp/client/core/blimp_contents_impl.h b/blimp/client/core/blimp_contents_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..8710ab10a1e10f425c2b063783d53a20d6c6954c
--- /dev/null
+++ b/blimp/client/core/blimp_contents_impl.h
@@ -0,0 +1,50 @@
+// 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.
+
+#ifndef BLIMP_CLIENT_CORE_BLIMP_CONTENTS_IMPL_H_
+#define BLIMP_CLIENT_CORE_BLIMP_CONTENTS_IMPL_H_
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "blimp/client/core/blimp_navigation_controller_delegate.h"
+#include "blimp/client/core/blimp_navigation_controller_impl.h"
+#include "blimp/client/core/public/blimp_contents.h"
+#include "url/gurl.h"
+
+namespace blimp {
+namespace client {
+
+class BlimpContentsObserver;
+class BlimpNavigationController;
+
+// BlimpContentsImpl is the implementation of the core class in
+// //blimp/client/core, the BlimpContents.
+class BlimpContentsImpl : public BlimpContents,
+                          public BlimpNavigationControllerDelegate {
+ public:
+  BlimpContentsImpl();
+  ~BlimpContentsImpl() override;
+
+  // BlimpContents implementation.
+  BlimpNavigationControllerImpl& GetNavigationController() override;
+  void AddObserver(BlimpContentsObserver* observer) override;
+  void RemoveObserver(BlimpContentsObserver* observer) override;
+
+  // BlimpNavigationControllerDelegate implementation.
+  void NotifyURLLoaded(const GURL& url) override;
+
+ private:
+  // Handles the back/forward list and loading URLs.
+  BlimpNavigationControllerImpl navigation_controller_;
+
+  // A list of all the observers of this BlimpContentsImpl.
+  base::ObserverList<BlimpContentsObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlimpContentsImpl);
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_CORE_BLIMP_CONTENTS_IMPL_H_