Vibration cannot be canceled during pattern vibration.

Source/modules/vibration/NavigatorVibration.cpp

Index: Source/modules/vibration/NavigatorVibration.cpp
diff --git a/Source/modules/vibration/NavigatorVibration.cpp b/Source/modules/vibration/NavigatorVibration.cpp
index 05ff456debd2367b505d37ca5edcd887586c4229..987f48c2dd5e0343407916d044036ea680ea334a 100644
--- a/Source/modules/vibration/NavigatorVibration.cpp
+++ b/Source/modules/vibration/NavigatorVibration.cpp
@@ -85,6 +85,7 @@ bool NavigatorVibration::vibrate(const VibrationPattern& pattern)
     }
 
     m_timerStart.startOneShot(0);
+    m_isVibrating = true;
     return true;
 }
 
@@ -103,7 +104,6 @@ void NavigatorVibration::timerStartFired(Timer<NavigatorVibration>* timer)
     ASSERT_UNUSED(timer, timer == &m_timerStart);
 
     if (m_pattern.size()) {
-        m_isVibrating = true;
         WebKit::Platform::current()->vibrate(m_pattern[0]);
         m_timerStop.startOneShot(m_pattern[0] / 1000.0);
         m_pattern.remove(0);
@@ -114,7 +114,8 @@ void NavigatorVibration::timerStopFired(Timer<NavigatorVibration>* timer)
 {
     ASSERT_UNUSED(timer, timer == &m_timerStop);
 
-    m_isVibrating = false;
+    if (!m_pattern.size())
+        m_isVibrating = false;
 
     if (m_pattern.size()) {
         m_timerStart.startOneShot(m_pattern[0] / 1000.0);