FrameLayout
onLayout
View
View.setFrame
child.layout
LinearLayout.layoutVertical然后就是遍历子view，走View.layout
ViewRootImpl.performLayout
LnearLayout
View.layout
super.onLayout
FrameLayout.layoutChildren
FrameLayout.onLayout
child就是LinearLayout，此时会调用View.layout，然后走LinearLayout.onLayout
host.layout
DecorView
host就是DecorView
LinearLayout.onLayout
DecorView.onLayout
ViewRootImpl
