Introduce ui/wm/ directory.

apps/shell/app_shell_browser_main_parts.cc

Index: apps/shell/app_shell_browser_main_parts.cc
diff --git a/apps/shell/app_shell_browser_main_parts.cc b/apps/shell/app_shell_browser_main_parts.cc
index 8a369df3b53aa26b28594e7b757be5b7d5cac717..5c9000d13ccddce313be5b7eddca99347a181d45 100644
--- a/apps/shell/app_shell_browser_main_parts.cc
+++ b/apps/shell/app_shell_browser_main_parts.cc
@@ -11,7 +11,7 @@
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/test_screen.h"
-#include "ui/shell/minimal_shell.h"
+#include "ui/wm/test/minimal_shell.h"
 
 namespace apps {
 
@@ -42,7 +42,7 @@ void AppShellBrowserMainParts::PreMainMessageLoopRun() {
   gfx::Screen::SetScreenInstance(
       gfx::SCREEN_TYPE_NATIVE, aura::TestScreen::Create());
   // Set up basic pieces of views::corewm.
-  minimal_shell_.reset(new shell::MinimalShell(gfx::Size(800, 600)));
+  minimal_shell_.reset(new wm::MinimalShell(gfx::Size(800, 600)));
   // Ensure the X window gets mapped.
   minimal_shell_->root_window()->host()->Show();