SF: Add support for screen captures

Add Layer::drawNow to support capturing portions
of the screen in the FE, as this is not tied
to vsync

Test: Compile/Run manually
Merged-Id: I0781d44240ae127a6e70b35282a02cbedfe36fe4
Change-Id: I0781d44240ae127a6e70b35282a02cbedfe36fe4
diff --git a/services/surfaceflinger/ContainerLayer.cpp b/services/surfaceflinger/ContainerLayer.cpp
index f259d93..320c0df 100644
--- a/services/surfaceflinger/ContainerLayer.cpp
+++ b/services/surfaceflinger/ContainerLayer.cpp
@@ -30,6 +30,8 @@
 
 void ContainerLayer::onDraw(const RenderArea&, const Region& /* clip */, bool) const {}
 
+void ContainerLayer::drawNow(const RenderArea&, bool) const {}
+
 bool ContainerLayer::isVisible() const {
     return !isHiddenByPolicy();
 }