[gin] enable harmony templates, e.g. `foo${var}bar`.
[evita] views: Move tab implementation to "views/tabs/tab.{cc,h}" from "views/tab_strip.cc".
[evita] ui/events: Introduce |ui::EventDispatcher| for handling event handler destruction during event dispatching.
[common] win: Introduce |Point common::Point::operator+(const Point&)|.
[evita] gfx: Revise offset bounds handling.
[evita] ui/controls: Make |ui::Button::MarkDirty()| to do nothing when it has been already dirty.
[evita] views: Use |ui::Widget| to represent tab.
[evita] views/tabs: Rename |views::ViewDelegate| to |views::TabOwner|.
[evita] ui/animation: Introduce |ui::AnimationFloat::Start(base::Time)| along with |is_started()|.
[evita] ui/animation: Introduce |ui::AnimationGroup| and |ui::AnimationGroupMember| classes.
[evita] views: Introduce glow animation for tab hovering.