aura: Make sure the tests we want to compile get built.

ui/aura_shell/default_container_layout_manager.h

Index: ui/aura_shell/default_container_layout_manager.h
diff --git a/ui/aura_shell/default_container_layout_manager.h b/ui/aura_shell/default_container_layout_manager.h
index 3ea8946a03a80d372ca26137d91a4bad7550ec05..a693024ebee85e8ebf83a47781ff80657e66bb11 100644
--- a/ui/aura_shell/default_container_layout_manager.h
+++ b/ui/aura_shell/default_container_layout_manager.h
@@ -9,6 +9,7 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/layout_manager.h"
+#include "ui/aura_shell/aura_shell_export.h"
 
 namespace aura {
 class Window;
@@ -22,7 +23,8 @@ namespace aura_shell {
 namespace internal {
 
 // LayoutManager for the default window container.
-class DefaultContainerLayoutManager : public aura::LayoutManager {
+class AURA_SHELL_EXPORT DefaultContainerLayoutManager
+    : public aura::LayoutManager {
  public:
   explicit DefaultContainerLayoutManager(aura::Window* owner);
   virtual ~DefaultContainerLayoutManager();