Fix crash when dragging a half width window to split view from overivew mode

athena/wm/window_manager_impl_test_api.cc

Index: athena/wm/window_manager_impl_test_api.cc
diff --git a/athena/wm/window_manager_impl_test_api.cc b/athena/wm/window_manager_impl_test_api.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f8c94df21afec60576a0d2e605c1baa07b8abf5a
--- /dev/null
+++ b/athena/wm/window_manager_impl_test_api.cc
@@ -0,0 +1,30 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "athena/wm/window_manager_impl_test_api.h"
+
+#include "athena/wm/window_manager_impl.h"
+
+namespace athena {
+
+WindowManagerImplTestApi::WindowManagerImplTestApi()
+    : wm_(static_cast<WindowManagerImpl*>(WindowManager::GetInstance())) {
+}
+
+WindowManagerImplTestApi::~WindowManagerImplTestApi() {
+}
+
+WindowManager* WindowManagerImplTestApi::wm() {
+  return wm_;
+}
+
+WindowListProvider* WindowManagerImplTestApi::GetWindowListProvider() {
+  return wm_->window_list_provider_.get();
+}
+
+SplitViewController* WindowManagerImplTestApi::GetSplitViewController() {
+  return wm_->split_view_controller_.get();
+}
+
+}  // namespace athena