CrOS Tablet Window management - Split Screen part I

ash/wm/workspace/backdrop_controller.cc

Index: ash/wm/workspace/backdrop_controller.cc
diff --git a/ash/wm/workspace/backdrop_controller.cc b/ash/wm/workspace/backdrop_controller.cc
index b73113f0d316c163fa7d94d55429c69231c8c0ae..ae52971da16cd90f5ef9afaea8627ca46bf14f71 100644
--- a/ash/wm/workspace/backdrop_controller.cc
+++ b/ash/wm/workspace/backdrop_controller.cc
@@ -141,6 +141,19 @@ void BackdropController::OnOverviewModeStarting() {
 }
 
 void BackdropController::OnOverviewModeEnded() {
+  if (Shell::Get()->IsSplitViewModeActive())
+    return;
+
+  force_hidden_ = false;
+  UpdateBackdrop();
+}
+
+void BackdropController::OnSplitViewModeStarting() {
+  force_hidden_ = true;
+  Hide();
+}
+
+void BackdropController::OnSplitViewModeEnded() {
   force_hidden_ = false;
   UpdateBackdrop();
 }