mus: Add PointerWatcher for passively observing mouse and touch events

chrome/browser/ui/ash/chrome_shell_delegate.h

Index: chrome/browser/ui/ash/chrome_shell_delegate.h
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.h b/chrome/browser/ui/ash/chrome_shell_delegate.h
index fe69109fccef7cd96fe511535c3c915957ddb8e4..88ca85a08bc64d2fb058fddda5d91a57a0f4bd02 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.h
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.h
@@ -60,6 +60,7 @@ class ChromeShellDelegate : public ash::ShellDelegate,
   ash::AccessibilityDelegate* CreateAccessibilityDelegate() override;
   ash::NewWindowDelegate* CreateNewWindowDelegate() override;
   ash::MediaDelegate* CreateMediaDelegate() override;
+  ash::PointerWatcherDelegate* CreatePointerWatcherDelegate() override;
   ui::MenuModel* CreateContextMenu(ash::Shelf* shelf,
                                    const ash::ShelfItem* item) override;
   ash::GPUSupport* CreateGPUSupport() override;