https://bugs.webkit.org/show_bug.cgi?id=117822

Reviewed by Gyuyoung Kim.

Source/WebCore:

Vibration can not cancel during pattern vibration is working. If resting time which are
even numbers of pattern m_isVibraing will be false and cancel will thus return early.
In addition, m_timerStart needs to be stopped in the cancelVibration().
If cancelVibration() is called right after m_timerStart is fired, timerStartFired
function can be called even if vibration is already canceled because of timing issue of timer.

Test: vibration/cancelVibration-during-pattern-vibrating.html

* Modules/vibration/Vibration.cpp:
(WebCore::Vibration::vibrate):
(WebCore::Vibration::cancelVibration):
(WebCore::Vibration::suspendVibration):
(WebCore::Vibration::resumeVibration):
(WebCore::Vibration::stopVibration):
(WebCore::Vibration::timerStartFired):
(WebCore::Vibration::timerStopFired):
* Modules/vibration/Vibration.h:

LayoutTests:

Add a test case for vibration cancelation during pattern vibration.
In addition, restore visibilityState before executing cancelVibration-after-pagevisibility-changed-to-hidden.html.

* vibration/cancelVibration-after-pagevisibility-changed-to-hidden.html:
* vibration/cancelVibration-during-pattern-vibrating-expected.txt: Added.
* vibration/cancelVibration-during-pattern-vibrating.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@152070 268f45cc-cd09-0410-ab3c-d52691b4dbfc