Use primary display as hangout/gtalk broadcast window

ash/display/display_controller.cc

 // 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.
 
 #include "ash/display/display_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 
@@ skipping 443 matching lines @@
     }
   }
   if (display_manager->GetNumDisplays() > 1) {
     UpdateDisplayBoundsForLayout();
     DisplayIdPair pair = GetCurrentDisplayIdPair();
     DisplayLayout layout = GetCurrentDisplayLayout();
     SetPrimaryDisplayId(
         layout.primary_id == gfx::Display::kInvalidDisplayID ?
         pair.first : layout.primary_id);
   }
+  UpdateHostWindowNames();
 }
 
 void DisplayController::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void DisplayController::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
@@ skipping 536 matching lines @@
           primary_id == gfx::Display::kInvalidDisplayID ?
           pair.first : primary_id);
       // Update the primary_id in case the above call is
       // ignored. Happens when a) default layout's primary id
       // doesn't exist, or b) the primary_id has already been
       // set to the same and didn't update it.
       paired_layouts_[pair].primary_id = GetPrimaryDisplay().id();
     }
   }
   FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanged());
+  UpdateHostWindowNames();
 }
 
 void DisplayController::RegisterLayoutForDisplayIdPairInternal(
     int64 id1,
     int64 id2,
     const DisplayLayout& layout,
     bool override) {
   DisplayIdPair pair = std::make_pair(id1, id2);
   if (override || paired_layouts_.find(pair) == paired_layouts_.end())
     paired_layouts_[pair] = layout;
 }
 
 void DisplayController::OnFadeOutForSwapDisplayFinished() {
 #if defined(OS_CHROMEOS) && defined(USE_X11)
   SetPrimaryDisplay(ScreenAsh::GetSecondaryDisplay());
   Shell::GetInstance()->output_configurator_animation()->StartFadeInAnimation();
 #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