[sensors] Add Permission guard to the generic sensor apis.

chrome/browser/content_settings/tab_specific_content_settings.h

Index: chrome/browser/content_settings/tab_specific_content_settings.h
diff --git a/chrome/browser/content_settings/tab_specific_content_settings.h b/chrome/browser/content_settings/tab_specific_content_settings.h
index edbd1cb28bfa5daa759b4ebd3aa02b2cf9dc8c1d..878cb7be3c471dbc3230f6336a4df67480c726d1 100644
--- a/chrome/browser/content_settings/tab_specific_content_settings.h
+++ b/chrome/browser/content_settings/tab_specific_content_settings.h
@@ -265,6 +265,14 @@ class TabSpecificContentSettings
     return midi_usages_state_;
   }
 
+  /*
+    // Returns the ContentSettingsUsageState that controls the Sensors usage on
+    // this page.
+    const ContentSettingsUsagesState& sensors_usages_state() const {
+      return sensors_usages_state_;
+    }
+  */
+
   // Call to indicate that there is a protocol handler pending user approval.
   void set_pending_protocol_handler(const ProtocolHandler& handler) {
     pending_protocol_handler_ = handler;
@@ -373,6 +381,10 @@ class TabSpecificContentSettings
   void OnMidiSysExAccessed(const GURL& reqesting_origin);
   void OnMidiSysExAccessBlocked(const GURL& requesting_origin);
 
+  // There methods are called to update the status about Sensor access.
+  void OnSensorAccessed(const GURL& reqesting_origin);
+  void OnSensorAccessBlocked(const GURL& requesting_origin);
+
   // Adds the given |SiteDataObserver|. The |observer| is notified when a
   // locale shared object, like for example a cookie, is accessed.
   void AddSiteDataObserver(SiteDataObserver* observer);
@@ -415,12 +427,20 @@ class TabSpecificContentSettings
   // Clears the MIDI settings.
   void ClearMidiContentSettings();
 
+  // TODO(riju): when UMA is ready.
+  // Clears the Sensor settings.
+  // void ClearSensorContentSettings();
+
   // Updates Geolocation settings on navigation.
   void GeolocationDidNavigate(content::NavigationHandle* navigation_handle);
 
   // Updates MIDI settings on navigation.
   void MidiDidNavigate(content::NavigationHandle* navigation_handle);
 
+  // TODO(riju): when UMA is ready.
+  // Updates Sensor settings on navigation.
+  // void SensorDidNavigate(content::NavigationHandle* navigation_handle);
+
   // All currently registered |SiteDataObserver|s.
   base::ObserverList<SiteDataObserver> observer_list_;
 
@@ -442,6 +462,9 @@ class TabSpecificContentSettings
   // Manages information about MIDI usages in this page.
   ContentSettingsUsagesState midi_usages_state_;
 
+  // Manages information about sensors usages in this page.
+  // ContentSettingsUsagesState sensors_usages_state_;
+
   // The pending protocol handler, if any. This can be set if
   // registerProtocolHandler was invoked without user gesture.
   // The |IsEmpty| method will be true if no protocol handler is