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

Index: chrome/browser/extensions/api/tabs/tabs_event_router.h
diff --git a/chrome/browser/extensions/api/tabs/tabs_event_router.h b/chrome/browser/extensions/api/tabs/tabs_event_router.h
index 73ee2c95945800530d26e0e89ebcf410b8c8dc4a..1a5eb3283dec203c18818b4ca9cab2761ba67efe 100644
--- a/chrome/browser/extensions/api/tabs/tabs_event_router.h
+++ b/chrome/browser/extensions/api/tabs/tabs_event_router.h
@@ -84,6 +84,14 @@ class TabsEventRouter : public TabStripModelObserver,
   // 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);
 
@@ -129,6 +137,7 @@ class TabsEventRouter : public TabStripModelObserver,
   //  - 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
@@ -150,6 +159,12 @@ class TabsEventRouter : public TabStripModelObserver,
     // 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
@@ -157,6 +172,10 @@ class TabsEventRouter : public TabStripModelObserver,
     // 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_;
   };