Add more logging to get information from plugin tests when they flake.

content/child/npapi/webplugin_delegate_impl_win.cc

Index: content/child/npapi/webplugin_delegate_impl_win.cc
diff --git a/content/child/npapi/webplugin_delegate_impl_win.cc b/content/child/npapi/webplugin_delegate_impl_win.cc
index 1b2e866f5d374d093485d245be71776b589e1b7f..7781c5a5ed89d439d090aa38c9fc8231f726c944 100644
--- a/content/child/npapi/webplugin_delegate_impl_win.cc
+++ b/content/child/npapi/webplugin_delegate_impl_win.cc
@@ -508,7 +508,8 @@ bool WebPluginDelegateImpl::WindowedCreatePlugin() {
       std::wstring plugin_name = plugin_lib->plugin_info().name;
       if (!plugin_name.empty()) {
         ATOM plugin_name_atom = GlobalAddAtomW(plugin_name.c_str());
-        DCHECK_NE(0, plugin_name_atom);
+        DCHECK_NE(0, plugin_name_atom) << " last error = " <<

[scottmg, 2014/08/27 16:58:56]

DPCHECK_NE? ... oh, apparently we only have DPCHECK and DCHECK_NE but not all
permutations, hrm.

+            GetLastError();
         result = SetProp(windowed_handle_,
             kPluginNameAtomProperty,
             reinterpret_cast<HANDLE>(plugin_name_atom));