Implement pointer lock across outer/inner WebContents.

extensions/browser/guest_view/web_view/web_view_guest.cc

Index: extensions/browser/guest_view/web_view/web_view_guest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.cc b/extensions/browser/guest_view/web_view/web_view_guest.cc
index 4276b3c9af6e79f98dbc8a99223c0b5b795a0ea8..47f4a6eebccae4b3e4006cae83a57e803ebed487 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -1375,6 +1375,16 @@ bool WebViewGuest::IsFullscreenForTabOrPending(
   return is_guest_fullscreen_;
 }
 
+void WebViewGuest::RequestToLockMouse(WebContents* web_contents,
+                                      bool user_gesture,
+                                      bool last_unlocked_by_target) {
+  RequestPointerLockPermission(
+      user_gesture, last_unlocked_by_target,
+      base::Bind(
+          base::IgnoreResult(&WebContents::GotResponseToLockMouseRequest),
+          base::Unretained(web_contents)));
+}
+
 void WebViewGuest::LoadURLWithParams(
     const GURL& url,
     const content::Referrer& referrer,