views impl: hide top infobar arrow when omnibox popup shows

chrome/browser/ui/omnibox/omnibox_popup_model_observer.h

Index: chrome/browser/ui/omnibox/omnibox_popup_model_observer.h
diff --git a/chrome/browser/ui/omnibox/omnibox_popup_model_observer.h b/chrome/browser/ui/omnibox/omnibox_popup_model_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..c21db6498b31a0e3c0db89cf4fae2f7c2f828920
--- /dev/null
+++ b/chrome/browser/ui/omnibox/omnibox_popup_model_observer.h
@@ -0,0 +1,16 @@
+// Copyright (c) 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 CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_POPUP_MODEL_OBSERVER_H_
+#define CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_POPUP_MODEL_OBSERVER_H_
+
+// Allows observers to react and update accordingly when state of
+// |OmniboxPopupModel| changes, e.g. when the omnibox popup is shown or hidden.
+class OmniboxPopupModelObserver {
+ public:
+  // Informs observers that omnibox popup has been shown or hidden.
+  virtual void OnOmniboxPopupShownOrHidden() = 0;
+};
+
+#endif  // CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_POPUP_MODEL_OBSERVER_H_