Add audible, muted to Tab, c.t.query, c.t.update, and c.t.onUpdated where relevant

chrome/browser/extensions/api/tabs/tabs_event_router.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_BROWSER_EXTENSIONS_API_TABS_TABS_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_EVENT_ROUTER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 66 matching lines @@
       const ui_zoom::ZoomController::ZoomChangedEventData& data) override;
 
  private:
   // "Synthetic" event. Called from TabInsertedAt if new tab is detected.
   void TabCreatedAt(content::WebContents* contents, int index, bool active);
 
   // Internal processing of tab updated events. Is called by both TabChangedAt
   // and Observe/NAV_ENTRY_COMMITTED.
   void TabUpdated(content::WebContents* contents, bool did_navigate);
 
+  // Internal processing of tab audible and muted state change events.
+  // Called by TabUpdated.
+  void TabAudibleStateChanged(content::WebContents* contents,
+                              bool audible);
+  void TabMutedStateChanged(content::WebContents* contents,
+                            bool muted,
+                            const std::string& cause);
+
   // Triggers a tab updated event if the favicon URL changes.
   void FaviconUrlUpdated(content::WebContents* contents);
 
   // The DispatchEvent methods forward events to the |profile|'s event router.
   // The TabsEventRouter listens to events for all profiles,
   // so we avoid duplication by dropping events destined for other profiles.
   void DispatchEvent(Profile* profile,
                      const std::string& event_name,
                      scoped_ptr<base::ListValue> args,
                      EventRouter::UserGestureState user_gesture);
@@ skipping 25 matching lines @@
   // Removes notifications added in RegisterForTabNotifications.
   void UnregisterForTabNotifications(content::WebContents* contents);
 
   content::NotificationRegistrar registrar_;
 
   // Maintain some information about known tabs, so we can:
   //
   //  - distinguish between tab creation and tab insertion
   //  - not send tab-detached after tab-removed
   //  - reduce the "noise" of TabChangedAt() when sending events to extensions
+  //  - remember last muted and audible states to know if there was a change
   class TabEntry {
    public:
     // Create a new tab entry whose initial state is TAB_COMPLETE.  This
     // constructor is required because TabEntry objects placed inside an
     // std::map<> by value.
     TabEntry();
 
     // Update the load state of the tab based on its WebContents.  Returns true
     // if the state changed, false otherwise.  Whether the state has changed or
     // not is used to determine if events needs to be sent to extensions during
     // processing of TabChangedAt(). This method will "hold" a state-change
     // to "loading", until the DidNavigate() method which should always follow
     // it. Returns NULL if no updates should be sent.
     base::DictionaryValue* UpdateLoadState(
         const content::WebContents* contents);
 
     // Indicates that a tab load has resulted in a navigation and the
     // destination url is available for inspection. Returns NULL if no updates
     // should be sent.
     base::DictionaryValue* DidNavigate(const content::WebContents* contents);
 
+    // Keep track of previous audible and muted states and allow toggling them
+    bool AudibleChanged(bool val) const;
+    bool MutedChanged(bool val) const;
+    void ToggleAudible();
+    void ToggleMuted();
+
    private:
     // Whether we are waiting to fire the 'complete' status change. This will
     // occur the first time the WebContents stops loading after the
     // NAV_ENTRY_COMMITTED was fired. The tab may go back into and out of the
     // loading state subsequently, but we will ignore those changes.
     bool complete_waiting_on_load_;
 
+    // Previous audible and muted states
+    bool wasAudible_;

[miu, 2015/03/10 18:51:39]

style: No camel case for variables in Chromium C++:

  bool was_audible_;
  bool was_muted_;

[Jared Sohn, 2015/03/16 02:34:29]

Done.

+    bool wasMuted_;
+
     GURL url_;
   };
 
   // Gets the TabEntry for the given |contents|. Returns TabEntry* if
   // found, NULL if not.
   TabEntry* GetTabEntry(content::WebContents* contents);
 
   std::map<int, TabEntry> tab_entries_;
 
   // The main profile that owns this event router.
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(TabsEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_TABS_TABS_EVENT_ROUTER_H_