Make tab audible and muted states and cause available for an extension API

content/browser/web_contents/web_contents_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 229 matching lines @@
   const base::string16& GetLoadStateHost() const override;
   uint64 GetUploadSize() const override;
   uint64 GetUploadPosition() const override;
   std::set<GURL> GetSitesInTab() const override;
   const std::string& GetEncoding() const override;
   bool DisplayedInsecureContent() const override;
   void IncrementCapturerCount(const gfx::Size& capture_size) override;
   void DecrementCapturerCount() override;
   int GetCapturerCount() const override;
   bool IsAudioMuted() const override;
-  void SetAudioMuted(bool mute) override;
+  void SetAudioMuted(bool muted, const std::string& cause) override;
+  const std::string& GetAudioMutedCause() const override;
   bool IsCrashed() const override;
   void SetIsCrashed(base::TerminationStatus status, int error_code) override;
   base::TerminationStatus GetCrashedStatus() const override;
   bool IsBeingDestroyed() const override;
   void NotifyNavigationStateChanged(InvalidateTypes changed_flags) override;
   base::TimeTicks GetLastActiveTime() const override;
   void WasShown() override;
   void WasHidden() override;
   bool NeedToFireBeforeUnload() override;
   void DispatchBeforeUnload(bool for_cross_site_transition) override;
@@ skipping 808 matching lines @@
   std::string canonical_encoding_;
 
   // True if this is a secure page which displayed insecure content.
   bool displayed_insecure_content_;
 
   // Whether the initial empty page has been accessed by another page, making it
   // unsafe to show the pending URL. Usually false unless another window tries
   // to modify the blank page.  Always false after the first commit.
   bool has_accessed_initial_document_;
 
+  // Source (initial, user, capture, extensionid) for the tab's muted state
+  std::string muted_toggle_cause_;
+
   // Data for misc internal state ----------------------------------------------
 
   // When > 0, the WebContents is currently being captured (e.g., for
   // screenshots or mirroring); and the underlying RenderWidgetHost should not
   // be told it is hidden.
   int capturer_count_;
 
   // Tracks whether RWHV should be visible once capturer_count_ becomes zero.
   bool should_normally_be_visible_;
 
@@ skipping 144 matching lines @@
   base::WeakPtrFactory<WebContentsImpl> loading_weak_factory_;
 
   bool virtual_keyboard_requested_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_