Use primary display as hangout/gtalk broadcast window

ash/display/display_controller.cc

Index: ash/display/display_controller.cc
diff --git a/ash/display/display_controller.cc b/ash/display/display_controller.cc
index bc1aeff7084338c7a1d0ccc5456ef37e7e1095a2..07542862a69a364545dc3eefea630c5673523960 100644
--- a/ash/display/display_controller.cc
+++ b/ash/display/display_controller.cc
@@ -461,6 +461,7 @@ void DisplayController::InitSecondaryDisplays() {
         layout.primary_id == gfx::Display::kInvalidDisplayID ?
         pair.first : layout.primary_id);
   }
+  UpdateHostWindowNames();
 }
 
 void DisplayController::AddObserver(Observer* observer) {
@@ -1017,6 +1018,7 @@ void DisplayController::NotifyDisplayConfigurationChanged() {
     }
   }
   FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanged());
+  UpdateHostWindowNames();
 }
 
 void DisplayController::RegisterLayoutForDisplayIdPairInternal(
@@ -1036,4 +1038,20 @@ void DisplayController::OnFadeOutForSwapDisplayFinished() {
 #endif
 }
 
+void DisplayController::UpdateHostWindowNames() {
+#if defined(USE_X11)
+  // crbug.com/120229 - set the window title for the primary dislpay
+  // to "aura_root_0" so gtalk can find the primary root window to broadcast.
+  // TODO(jhorwich) Remove this once Chrome supports window-based broadcasting.
+  aura::RootWindow* primary = Shell::GetPrimaryRootWindow();
+  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
+  for (size_t i = 0; i < root_windows.size(); ++i) {
+    std::string name =
+        root_windows[i] == primary ? "aura_root_0" : "aura_root_x";
+    gfx::AcceleratedWidget xwindow = root_windows[i]->GetAcceleratedWidget();
+    XStoreName(ui::GetXDisplay(), xwindow, name.c_str());
+  }
+#endif
+}
+
 }  // namespace ash