Refactor omnibox focus API into a single method.

chrome/common/omnibox_focus_state.h

+// Copyright 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_COMMON_OMNIBOX_FOCUS_STATE_H_
+#define CHROME_COMMON_OMNIBOX_FOCUS_STATE_H_
+
+// Omnibox focus state.
+enum OmniboxFocusState {
+  // Not focused.
+  OMNIBOX_FOCUS_NONE,
+
+  // Visibly focused.
+  OMNIBOX_FOCUS_VISIBLE,
+
+  // Invisibly focused, i.e. focused with a hidden caret.
+  //
+  // Omnibox will not look focused visibly but any user key strokes will go to
+  // the omnibox.
+  OMNIBOX_FOCUS_INVISIBLE,
+};
+
+#endif  // CHROME_COMMON_OMNIBOX_FOCUS_STATE_H_