Provide URL-related info to the VR HTML UI.

chrome/browser/android/vr_shell/vr_web_contents_observer.h

+// 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 CHROME_BROWSER_ANDROID_VR_SHELL_VR_WEB_CONTENTS_OBSERVER_H_
+#define CHROME_BROWSER_ANDROID_VR_SHELL_VR_WEB_CONTENTS_OBSERVER_H_
+
+#include "base/macros.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+class NavigationHandle;
+}
+
+namespace vr_shell {
+
+class UiInterface;
+
+class CONTENT_EXPORT VrWebContentsObserver
+    : public content::WebContentsObserver {
+ public:
+  explicit VrWebContentsObserver(content::WebContents* web_contents,

[bshe, 2016/10/27 20:27:44]

explicit is not needed for ctor that has two parameters

[cjgrant, 2016/10/28 14:16:59]

Done.

+                                 UiInterface *ui_interface);

[mthiesse, 2016/10/27 21:21:07]

nit: * on type

[cjgrant, 2016/10/28 14:16:59]

Done.

+  ~VrWebContentsObserver() override;
+
+  void SetUiInterface(UiInterface *ui_interface);

[mthiesse, 2016/10/27 21:21:07]

nit: * on type

[cjgrant, 2016/10/28 14:16:59]

Done.

+
+  // WebContentsObserver implementation.
+  void DidStartLoading() override;
+  void DidStopLoading() override;
+  void DidStartNavigation(
+      content::NavigationHandle* navigation_handle) override;
+
+ private:
+  // This class does not own the UI interface.
+  UiInterface* ui_interface_;
+
+  DISALLOW_COPY_AND_ASSIGN(VrWebContentsObserver);
+};
+
+}  // namespace vr_shell
+
+#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_WEB_CONTENTS_OBSERVER_H_