Removes the dependency to WMTestHelper from app shell.

apps/shell/browser/shell_desktop_controller.h

Index: apps/shell/browser/shell_desktop_controller.h
diff --git a/apps/shell/browser/shell_desktop_controller.h b/apps/shell/browser/shell_desktop_controller.h
index f1ba503ebfdf5fe9179f645811317fda8cf6a1d5..1d5ab0f1fabf7f2808a4508a756bb341dd570706 100644
--- a/apps/shell/browser/shell_desktop_controller.h
+++ b/apps/shell/browser/shell_desktop_controller.h
@@ -8,6 +8,7 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/window_tree_host_observer.h"
 #include "ui/gfx/geometry/size.h"
 
@@ -17,7 +18,12 @@
 
 namespace aura {
 class TestScreen;
+class Window;
 class WindowTreeHost;
+namespace client {
+class DefaultCaptureClient;
+class FocusClient;
+}
 }
 
 namespace content {
@@ -32,8 +38,9 @@ class UserActivityPowerManagerNotifier;
 
 namespace wm {
 class CursorManager;
+class CompoundEventFilter;
+class InputMethodEventFilter;
 class UserActivityDetector;
-class WMTestHelper;
 }
 
 namespace apps {
@@ -41,11 +48,12 @@ namespace apps {
 class ShellAppWindow;
 
 // Handles desktop-related tasks for app_shell.
-class ShellDesktopController
+class ShellDesktopController : aura::client::WindowTreeClient
 #if defined(OS_CHROMEOS)
-    : public ui::DisplayConfigurator::Observer
+                               ,
+                               public ui::DisplayConfigurator::Observer
 #endif
-      {
+                               {
  public:
   ShellDesktopController();
   virtual ~ShellDesktopController();
@@ -55,6 +63,9 @@ class ShellDesktopController
   // we need a singleton somewhere).
   static ShellDesktopController* instance();
 
+  // Creates the window that hosts the app.
+  void CreateRootWindow();
+
   // Creates a new app window and adds it to the desktop. The desktop maintains
   // ownership of the window.
   ShellAppWindow* CreateAppWindow(content::BrowserContext* context);
@@ -62,8 +73,10 @@ class ShellDesktopController
   // Closes and destroys the app window.
   void CloseAppWindow();
 
-  // Returns the host for the Aura window tree.
-  aura::WindowTreeHost* GetWindowTreeHost();
+  // Overridden from aura::client::WindowTreeClient:
+  virtual aura::Window* GetDefaultParent(aura::Window* context,
+                                         aura::Window* window,
+                                         const gfx::Rect& bounds) OVERRIDE;
 
 #if defined(OS_CHROMEOS)
   // ui::DisplayConfigurator::Observer overrides.
@@ -71,10 +84,16 @@ class ShellDesktopController
       ui::DisplayConfigurator::DisplayState>& displays) OVERRIDE;
 #endif
 
- private:
-  // Creates the window that hosts the app.
-  void CreateRootWindow();
+  aura::WindowTreeHost* host() {
+    return host_.get();
+  };
+
+ protected:
+  // Creates and sets the aura clients and window manager stuffs. Subclass may
+  // initialize different sets of the clients.
+  virtual void InitWindowManager();
 
+ private:
   // Closes and destroys the root window hosting the app.
   void DestroyRootWindow();
 
@@ -86,11 +105,18 @@ class ShellDesktopController
   scoped_ptr<ui::DisplayConfigurator> display_configurator_;
 #endif
 
-  // Enable a minimal set of views::corewm to be initialized.
-  scoped_ptr<wm::WMTestHelper> wm_test_helper_;
-
   scoped_ptr<aura::TestScreen> test_screen_;
 
+  scoped_ptr<aura::WindowTreeHost> host_;
+
+  scoped_ptr<wm::CompoundEventFilter> root_window_event_filter_;
+
+  scoped_ptr<aura::client::DefaultCaptureClient> capture_client_;
+
+  scoped_ptr<wm::InputMethodEventFilter> input_method_filter_;
+
+  scoped_ptr<aura::client::FocusClient> focus_client_;
+
   scoped_ptr<wm::CursorManager> cursor_manager_;
 
   scoped_ptr<wm::UserActivityDetector> user_activity_detector_;