[evita] views: Move canvas management to |views::MessageView::View|.
[evita] views: Get rid of redundant calls of |ui::Layer::SetBounds(const gfx::RectF&)|.
[evita] views: Introduce lazy canvas management in |views::MetricsView|
[evita] views: Rename |views::TabStripAnimator::SetLayer(ui::Layer*)| to |SetTabContentLayer(ui::Layer*)| for disambiguation.
[evita] ui: Tidying up |ui::TableControl|.