Unstable / failing tests for tst_qquickflickable

Looking at CI builds QtDeclarative_5.5_Integration

tst_qquickflickable has many unstabled tests, mostly on osx 10.10, but and windows

Sample builds that are failing:
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00136/macx-clang_developer-build_OSX_10.10
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00136/macx-clang_developer-build_OSX_10.9
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00135/macx-clang_developer-build_OSX_10.10
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00135/macx-clang_developer-build_OSX_10.9
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00134/macx-clang_developer-build_OSX_10.10
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00134/macx-clang_developer-build_OSX_10.9
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00133/macx-clang_developer-build_OSX_10.10
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00133/macx-clang_developer-build_OSX_10.9
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00133/win32-mingw48_developer-build_qtlibinfix_opengl_Windows_7
http://testresults.qt.io/ci/QtDeclarative_5.5_Integration/build_00113/win32-msvc2010_developer-build_qtnamespace_Windows_7

On osx 10.9, returnToBounds always fails.