Add support for a virtual display on ChromeOS

content/public/browser/desktop_media_id.cc

Index: content/public/browser/desktop_media_id.cc
diff --git a/content/public/browser/desktop_media_id.cc b/content/public/browser/desktop_media_id.cc
index 7817766e4d3e61de7ecd159d032a3cddb23b9dc8..c3823420e4b2781984bf583cefe4ca37a5fd739a 100644
--- a/content/public/browser/desktop_media_id.cc
+++ b/content/public/browser/desktop_media_id.cc
@@ -81,6 +81,7 @@ namespace content {
 const char kScreenPrefix[] = "screen";
 const char kWindowPrefix[] = "window";
 const char kAuraWindowPrefix[] = "aura_window";
+const char kAuraVirtualScreenPrefix[] = "aura_virtual_screen";
 
 #if defined(USE_AURA)
 
@@ -114,6 +115,8 @@ DesktopMediaID DesktopMediaID::Parse(const std::string& str) {
     type = TYPE_WINDOW;
   } else if (parts[0] == kAuraWindowPrefix) {
     type = TYPE_AURA_WINDOW;
+  } else if (parts[0] == kAuraVirtualScreenPrefix) {
+    type = TYPE_AURA_VIRTUAL_SCREEN;
   } else {
     return DesktopMediaID(TYPE_NONE, 0);
   }
@@ -140,6 +143,9 @@ std::string DesktopMediaID::ToString() {
     case TYPE_AURA_WINDOW:
       prefix = kAuraWindowPrefix;
       break;
+    case TYPE_AURA_VIRTUAL_SCREEN:
+      prefix = kAuraVirtualScreenPrefix;
+      break;
   }
   DCHECK(!prefix.empty());