[WebEngine] tst_qquickwebengineview.exe crashes occasionally

Microsoft (R) Program Maintenance Utility Version 14.00.23918.0
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	call C:\Users\qt\work\qt\qtwebengine\tests\auto\quick\qquickwebengineview\target_wrapper.bat  release\tst_qquickwebengineview.exe -o c:\Users\qt\work\testresults\tests\auto\quick\qquickwebengineview531125940,xml -o -,txt
********* Start testing of tst_QQuickWebEngineView *********

** Config: Using QtTest library 5.8.0, Qt 5.8.0 (x86_64-little_endian-llp64 shared (dynamic) release build; by MSVC 2015)
PASS   : tst_QQuickWebEngineView::initTestCase()
PASS   : tst_QQuickWebEngineView::navigationStatusAtStartup()
PASS   : tst_QQuickWebEngineView::stopEnabledAfterLoadStarted()
PASS   : tst_QQuickWebEngineView::baseUrl()
PASS   : tst_QQuickWebEngineView::loadEmptyUrl()
PASS   : tst_QQuickWebEngineView::loadEmptyPageViewVisible()
PASS   : tst_QQuickWebEngineView::loadEmptyPageViewHidden()
PASS   : tst_QQuickWebEngineView::loadNonexistentFileUrl()
PASS   : tst_QQuickWebEngineView::backAndForward()
PASS   : tst_QQuickWebEngineView::reload()
PASS   : tst_QQuickWebEngineView::stop()
PASS   : tst_QQuickWebEngineView::loadProgress()
PASS   : tst_QQuickWebEngineView::show()
PASS   : tst_QQuickWebEngineView::showWebEngineView()
PASS   : tst_QQuickWebEngineView::removeFromCanvas()
PASS   : tst_QQuickWebEngineView::multipleWebEngineViewWindows()
PASS   : tst_QQuickWebEngineView::multipleWebEngineViews()
PASS   : tst_QQuickWebEngineView::titleUpdate()
A crash occurred in C:\Users\qt\work\qt\qtwebengine\tests\auto\quick\qquickwebengineview\release\tst_qquickwebengineview.exe.
Function time: 350ms Total time: 6976ms

Exception address: 0x00007FF9F643D044
Exception code   : 0xc0000005
Nearby symbol    : wglGetExtensionsStringARB

Stack:
#  1: QTest::toString() - 0x00007FFA0C96A260
#  2: UnhandledExceptionFilter() - 0x00007FFA172B0180
#  3: memset() - 0x00007FFA1A698140
#  4: _C_specific_handler() - 0x00007FFA1A683ED0
#  5: _chkstk() - 0x00007FFA1A696240
#  6: RtlWalkFrameChain() - 0x00007FFA1A6126A0
#  7: KiUserExceptionDispatcher() - 0x00007FFA1A695410
#  8: wglGetExtensionsStringARB() - 0x00007FF9F5CC3330

NMAKE : fatal error U1077: 'call' : return code '0xc0000005'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe"' : return code '0x2'
Stop.

** Date: 2016/11/05