Media Remoting: Add interstitial elements to media element shadow dom.

third_party/WebKit/Source/modules/accessibility/AXMediaControls.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXMediaControls.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXMediaControls.cpp b/third_party/WebKit/Source/modules/accessibility/AXMediaControls.cpp
index d00ae6c1a38582c166bf3618dc70515283b3d8ce..c901e8efa6612b54243adac8aaac30be257fb4c3 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXMediaControls.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXMediaControls.cpp
@@ -86,6 +86,7 @@ AXObject* AccessibilityMediaControl::Create(
     case kMediaOverflowButton:
     case kMediaOverflowList:
     case kMediaDownloadButton:
+    case kMediaRemotingCastIcon:
       return new AccessibilityMediaControl(layout_object, ax_object_cache);
   }
 
@@ -152,6 +153,8 @@ String AccessibilityMediaControl::TextAlternative(
     case kMediaSlider:
       NOTREACHED();
       return QueryString(WebLocalizedString::kAXMediaDefault);
+    case kMediaRemotingCastIcon:
+      return QueryString(WebLocalizedString::kAXMediaRemotingCastIcon);
   }
 
   NOTREACHED();
@@ -208,6 +211,8 @@ String AccessibilityMediaControl::Description(
     case kMediaSlider:
       NOTREACHED();
       return QueryString(WebLocalizedString::kAXMediaDefault);
+    case kMediaRemotingCastIcon:
+      return QueryString(WebLocalizedString::kAXMediaRemotingCastIcon);
   }
 
   NOTREACHED();
@@ -241,6 +246,7 @@ AccessibilityRole AccessibilityMediaControl::RoleValue() const {
     case kMediaDownloadButton:
     case kMediaCastOnButton:
     case kMediaCastOffButton:
+    case kMediaRemotingCastIcon:
       return kButtonRole;
 
     case kMediaTimelineContainer: