Support sharing of ContentMain and BrowserMain code with embedded use cases.

content/shell/shell.h

Index: content/shell/shell.h
===================================================================
--- content/shell/shell.h	(revision 117304)
+++ content/shell/shell.h	(working copy)
@@ -15,6 +15,11 @@
 #include "content/public/browser/web_contents_delegate.h"
 #include "ui/gfx/native_widget_types.h"
 
+#if defined(OS_WIN)
+// Define this value to test embedded message loop integration.

[jam, 2012/01/12 18:07:18]

adding test code in production code isn't how we do tests, i.e. we'd write a
unit tests for something like this.

+#define TEST_EMBEDDED_MESSAGE_LOOP
+#endif
+
 class GURL;
 class SiteInstance;
 class TabContents;