Scrim: a thing that hides or hides something.
According to Android CollapsingToolbarLayout:
Content Content: A hidden canvas that is displayed or hidden when the scroll position has reached a certain threshold. You can change this with setContentScrim (Drawable).
You can use drawable as a canvas on top of the contents of CollapsingToolbarLayouts when it scrolls far enough from the screen.
app:contentScrim="YOUR_TOOLBAR_COLOR"
: , , . setStatusBarScrim (Drawable). LOLLIPOP, .
drawable scrim , CollapsingToolbarLayout .
app:statusBarScrim="YOUR_STATUSBAR_COLOR"
, !