SelectionOwner: add support for TIMESTAMP target

ui/base/dragdrop/os_exchange_data_provider_aurax11.cc

Index: ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
diff --git a/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc b/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
index e2bba47010817ff4a1abbbbb0ad93fa87c0fbe82..943cb64abba6efa30b55843fae168ed09df9d85e 100644
--- a/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
+++ b/ui/base/dragdrop/os_exchange_data_provider_aurax11.cc
@@ -83,6 +83,7 @@ OSExchangeDataProviderAuraX11::OSExchangeDataProviderAuraX11()
   atom_cache_.allow_uncached_atoms();
 
   XStoreName(x_display_, x_window_, "Chromium Drag & Drop Window");
+  XSelectInput(x_display_, x_window_, PropertyChangeMask);
 
   PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
 }