Remove unnecessary dispatchInsets routing

Insets are dispatched to all views. We never consume the insets and
let each view decide what to do with it.
Also fixing scrim in all-apps when in full-gesture navigation

Change-Id: Ib1c6bef5b32aac0c6ea03078b5138d2d0408c6d8
diff --git a/src/com/android/launcher3/LauncherRootView.java b/src/com/android/launcher3/LauncherRootView.java
index 20eec05..49b380b 100644
--- a/src/com/android/launcher3/LauncherRootView.java
+++ b/src/com/android/launcher3/LauncherRootView.java
@@ -14,7 +14,6 @@
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.ViewDebug;
-import android.view.WindowInsets;
 
 import java.util.Collections;
 import java.util.List;
@@ -101,7 +100,7 @@
             mLauncher.getStateManager().reapplyState(true /* cancelCurrentAnimation */);
         }
 
-        return true; // I'll take it from here
+        return false; // Let children get the full insets
     }
 
     @Override
@@ -157,12 +156,6 @@
     }
 
     @Override
-    public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {
-        mLauncher.getDragLayer().updateTouchExcludeRegion(insets);
-        return super.dispatchApplyWindowInsets(insets);
-    }
-
-    @Override
     protected void onLayout(boolean changed, int l, int t, int r, int b) {
         super.onLayout(changed, l, t, r, b);
         SYSTEM_GESTURE_EXCLUSION_RECT.get(0).set(l, t, r, b);