Notify in console when an API fails because it needs to be invoked on user action.

Source/core/page/PointerLockController.cpp

Index: Source/core/page/PointerLockController.cpp
diff --git a/Source/core/page/PointerLockController.cpp b/Source/core/page/PointerLockController.cpp
index 8fe61a2b9d856ee3161823457530778e31b82dbc..6b3ac9cca6f1421265b634c94d1c1d986deb140f 100644
--- a/Source/core/page/PointerLockController.cpp
+++ b/Source/core/page/PointerLockController.cpp
@@ -49,6 +49,11 @@ PassOwnPtrWillBeRawPtr<PointerLockController> PointerLockController::create(Page
 
 void PointerLockController::requestPointerLock(Element* target)
 {
+    if (!UserGestureIndicator::processingUserGesture()) {
+        target->document().executionContext()->addConsoleMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel,
+            "requestPointerLock() can only be intiated by a user gesture."));

[meacer, 2014/09/26 17:47:38]

Same here, no need for paranthesis and intiated -> initiated

"requestPointerLock can only be initiated by a user gesture."

[Mayur Kankanwadi, 2014/09/29 11:22:13]

Done.

+    }
+
     if (!target || !target->inDocument() || m_documentOfRemovedElementWhileWaitingForUnlock) {
         enqueueEvent(EventTypeNames::pointerlockerror, target);
         return;