Add support for getting the 256x256 app icon on Windows.

ui/test/ui_unittests.rc

Index: ui/test/ui_unittests.rc
===================================================================
--- ui/test/ui_unittests.rc	(revision 0)
+++ ui/test/ui_unittests.rc	(working copy)
@@ -0,0 +1,36 @@
+// Microsoft Visual C++ generated resource script.
+//
+#include "ui_unittests_resource.h"
+
+#define APSTUDIO_READONLY_SYMBOLS
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 2 resource.
+//
+#define APSTUDIO_HIDDEN_SYMBOLS
+#include "windows.h"
+#undef APSTUDIO_HIDDEN_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+#undef APSTUDIO_READONLY_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+// English (U.S.) resources
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
+#ifdef _WIN32
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+#pragma code_page(1252)
+#endif //_WIN32
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Icon
+//
+
+// Icon with lowest ID value placed first to ensure application icon
+// remains consistent on all systems.
+IDR_MAINFRAME  ICON  "ui_unittests.ico"
+
+#endif    // English (U.S.) resources
+/////////////////////////////////////////////////////////////////////////////