Plumb audio muting state to guest web-contents.

components/guest_view/browser/guest_view_base.cc

 // Copyright 2014 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.
 
 #include "components/guest_view/browser/guest_view_base.h"
 
 #include <utility>
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
@@ skipping 93 matching lines @@
     }
   }
 
   void OnPageScaleFactorChanged(float page_scale_factor) override {
     if (destroyed_)
       return;
 
     guest_->web_contents()->SetPageScale(page_scale_factor);
   }
 
+  void DidUpdateAudioMutingState(bool muted) override {
+    if (destroyed_)
+      return;
+
+    guest_->web_contents()->SetAudioMuted(muted);
+  }
+
  private:
   bool is_fullscreen_;
   bool destroyed_;
   GuestViewBase* guest_;
 
   void Destroy() {
     if (destroyed_)
       return;
     destroyed_ = true;
     guest_->Destroy();
@@ skipping 270 matching lines @@
 
 void GuestViewBase::DidAttach(int guest_proxy_routing_id) {
   DCHECK(guest_proxy_routing_id_ == MSG_ROUTING_NONE ||
          guest_proxy_routing_id == guest_proxy_routing_id_);
   guest_proxy_routing_id_ = guest_proxy_routing_id;
 
   opener_lifetime_observer_.reset();
 
   SetUpSizing(*attach_params());
 
+  // The guest should have the same muting state as the owner.
+  web_contents()->SetAudioMuted(owner_web_contents()->IsAudioMuted());
+
   // Give the derived class an opportunity to perform some actions.
   DidAttachToEmbedder();
 
   // Inform the associated GuestViewContainer that the contentWindow is ready.
   embedder_web_contents()->Send(new GuestViewMsg_GuestAttached(
       element_instance_id_,
       guest_proxy_routing_id));
 
   SendQueuedEvents();
 }
@@ skipping 462 matching lines @@
 
 void GuestViewBase::UpdateGuestSize(const gfx::Size& new_size,
                                     bool due_to_auto_resize) {
   if (due_to_auto_resize)
     GuestSizeChangedDueToAutoSize(guest_size_, new_size);
   DispatchOnResizeEvent(guest_size_, new_size);
   guest_size_ = new_size;
 }
 
 }  // namespace guest_view