[WK2] Fix for Display error occur in Help Center of FaceBook page

[WK2] Fix for Display error occur in Help Center of FaceBook page

[Title] Fix for Display error occur in Help Center of FaceBook page
[issue#] N_SE-47968
[Problem] Display error occurs due to painting SolidColor
[Cause] SolidColor is not having premultiplied color, but TextureMapperGL always uses a premultiplied color for emulator
[Solution] We must convert an unmultiplied color to a premultiplied color.
           This patch is based on below open source patch.
           http://trac.webkit.org/changeset/139674
[Developer] shanmuga.m

Change-Id: I286e32c3722648b6cc4f36b3dbc6f0d8d621111d