mash: Have chrome set itself as the app list presenter.

ash/common/wm_shell.h

Index: ash/common/wm_shell.h
diff --git a/ash/common/wm_shell.h b/ash/common/wm_shell.h
index 65ad4a224964c49766a098168225dafb75667b19..b0d33214be1f0ffc120602d9640a34ee47b32811 100644
--- a/ash/common/wm_shell.h
+++ b/ash/common/wm_shell.h
@@ -21,6 +21,10 @@
 #include "ui/compositor/layer_type.h"
 #include "ui/wm/public/window_types.h"
 
+namespace app_list {
+class AppList;
+}
+
 namespace base {
 class SequencedWorkerPool;
 }
@@ -116,6 +120,8 @@ class ASH_EXPORT WmShell {
     return accessibility_delegate_.get();
   }
 
+  app_list::AppList* app_list() { return app_list_.get(); }
+
   BrightnessControlDelegate* brightness_control_delegate() {
     return brightness_control_delegate_.get();
   }
@@ -478,6 +484,7 @@ class ASH_EXPORT WmShell {
 
   std::unique_ptr<AcceleratorController> accelerator_controller_;
   std::unique_ptr<AccessibilityDelegate> accessibility_delegate_;
+  std::unique_ptr<app_list::AppList> app_list_;
   std::unique_ptr<BrightnessControlDelegate> brightness_control_delegate_;
   std::unique_ptr<CastConfigController> cast_config_;
   std::unique_ptr<FocusCycler> focus_cycler_;