Gtk+-3 ev-view: Set a style class on the view so it can be more easily styled

And share the style we use for other content views.
https://bugzilla.gnome.org/show_bug.cgi?id=653294

taken from:
https://git.gnome.org/browse/evince/commit/?id=a56186e

call gtk_style_context_set_background()

Even if we now render a background in _draw() with gtk_render_background,
using gtk_style_context_set_background() in realize
makes the backing GdkWindow not being completely transparent,
which enables GTK to apply optimizations during the paint cycle.
The result is, especially in clutter-gtk applications such as Documents,
scrolling in a document page is much smoother.

taken from:
https://git.gnome.org/browse/evince/commit/?id=1785924

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