Revert of Remove setVoiceSearchSupported part of EmbeddedSearch SearchBox API.

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h

Index: chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h
index b2adbb3277de4fc5e02516ad72fcea464943ac90..692a360e58fb85d5356f86a52090f2f7be70a207 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h
@@ -17,6 +17,7 @@
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 #include "chrome/browser/ui/location_bar/location_bar.h"
 #include "chrome/browser/ui/omnibox/chrome_omnibox_edit_controller.h"
+#include "chrome/browser/ui/search/search_model_observer.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/ui/zoom/zoom_event_manager_observer.h"
 
@@ -28,6 +29,7 @@
 class LocationBarDecoration;
 class LocationIconDecoration;
 class ManagePasswordsDecoration;
+class MicSearchDecoration;
 class PageActionDecoration;
 class Profile;
 class SelectedKeywordDecoration;
@@ -43,6 +45,7 @@
 class LocationBarViewMac : public LocationBar,
                            public LocationBarTesting,
                            public ChromeOmniboxEditController,
+                           public SearchModelObserver,
                            public ui_zoom::ZoomEventManagerObserver {
  public:
   LocationBarViewMac(AutocompleteTextField* field,
@@ -169,6 +172,10 @@
     return manage_passwords_decoration_.get();
   }
 
+  // SearchModelObserver:
+  void ModelChanged(const SearchModel::State& old_state,
+                    const SearchModel::State& new_state) override;
+
   Browser* browser() const { return browser_; }
 
   // ZoomManagerObserver:
@@ -212,6 +219,10 @@
   // Returns whether any updates were made.
   bool UpdateZoomDecoration(bool default_zoom_changed);
 
+  // Updates the voice search decoration. Returns true if the visible state was
+  // changed.
+  bool UpdateMicSearchDecorationVisibility();
+
   scoped_ptr<OmniboxViewMac> omnibox_view_;
 
   AutocompleteTextField* field_;  // owned by tab controller
@@ -245,6 +256,9 @@
   // Keyword hint decoration displayed on the right-hand side.
   scoped_ptr<KeywordHintDecoration> keyword_hint_decoration_;
 
+  // The voice search icon.
+  scoped_ptr<MicSearchDecoration> mic_search_decoration_;
+
   // The right-hand-side button to manage passwords associated with a page.
   scoped_ptr<ManagePasswordsDecoration> manage_passwords_decoration_;