mus: Add PointerWatcher for passively observing mouse and touch events

chrome/browser/ui/ash/chrome_shell_delegate.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.cc b/chrome/browser/ui/ash/chrome_shell_delegate.cc
index 7ea5b6089ac5392e6a477225e25898d4a96045f3..c58d4e6067de838aabe0588cd841d6ea5f3d07f4 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.cc
@@ -7,9 +7,11 @@
 #include <stddef.h>
 
 #include "ash/content/gpu_support_impl.h"
+#include "ash/pointer_watcher_delegate_aura.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/wm/common/window_state.h"
 #include "ash/wm/window_util.h"
+#include "base/memory/ptr_util.h"
 #include "build/build_config.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
@@ -154,6 +156,11 @@ ash::ShelfDelegate* ChromeShellDelegate::CreateShelfDelegate(
   return shelf_delegate_;
 }
 
+std::unique_ptr<ash::PointerWatcherDelegate>
+ChromeShellDelegate::CreatePointerWatcherDelegate() {
+  return base::WrapUnique(new ash::PointerWatcherDelegateAura);
+}
+
 ui::MenuModel* ChromeShellDelegate::CreateContextMenu(
     ash::Shelf* shelf,
     const ash::ShelfItem* item) {