Vibration cannot be canceled during pattern vibration.

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 993203917604244749d8cb602f15a5d1b3a8ea8f..6e74ec4286f01b7b4454922acecf7da62b97a5c0 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -100,6 +100,7 @@
 #include "core/rendering/RenderTreeAsText.h"
 #include "core/rendering/RenderView.h"
 #include "core/workers/WorkerThread.h"
+#include "modules/vibration/NavigatorVibration.h"
 #include "weborigin/SchemeRegistry.h"
 #include "wtf/dtoa.h"
 #include "wtf/text/StringBuffer.h"
@@ -1973,4 +1974,13 @@ bool Internals::isSelectPopupVisible(Node* node)
     return menuList->popupIsVisible();
 }
 
+bool Internals::isVibrating()
+{
+    Document* document = contextDocument();
+    ASSERT(document && document->domWindow());
+
+    fprintf(stderr, "isVibrating()\n");
+    return NavigatorVibration::from(document->domWindow()->navigator())->isVibrating();
+}
+
 }