Create Document exitPointerLock and pointerLockElement API methods.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index d72b199e7748170ca61273d51c844c2dcbe232c3..68ddd5915223b6930e887d937df8e3340655f482 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5064,6 +5064,11 @@ HTMLDialogElement* Document::activeModalDialog() const
 
 void Document::webkitExitPointerLock()
 {
+    exitPointerLock();
+}
+
+void Document::exitPointerLock()
+{
     if (!page())
         return;
     if (Element* target = page()->pointerLockController().element()) {
@@ -5075,6 +5080,11 @@ void Document::webkitExitPointerLock()
 
 Element* Document::webkitPointerLockElement() const
 {
+    return pointerLockElement();
+}
+
+Element* Document::pointerLockElement() const
+{
     if (!page() || page()->pointerLockController().lockPending())
         return 0;
     if (Element* element = page()->pointerLockController().element()) {