Make DockedStackDivider trusted

This is the divider that contains the handle in split-screen. It's
rendered by the system, so it's trusted.

Bug: 174847794
Bug: 158002302
Test: Tap around divider in split-screen, verify no toast or log about
      untrusted touches.
Change-Id: I9d5b56192bacd26fa2faff3c9a3b2f3bdcf0634f
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java b/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java
index 542867d..e412198 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java
@@ -22,6 +22,7 @@
 import static android.view.WindowManager.LayoutParams.FLAG_SPLIT_TOUCH;
 import static android.view.WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
 import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_NO_MOVE_ANIMATION;
+import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_TRUSTED_OVERLAY;
 import static android.view.WindowManager.LayoutParams.TYPE_DOCK_DIVIDER;
 
 import android.content.Context;
@@ -89,7 +90,7 @@
                 PixelFormat.TRANSLUCENT);
         lp.token = new Binder();
         lp.setTitle(DIVIDER_WINDOW_TITLE);
-        lp.privateFlags |= PRIVATE_FLAG_NO_MOVE_ANIMATION;
+        lp.privateFlags |= PRIVATE_FLAG_NO_MOVE_ANIMATION | PRIVATE_FLAG_TRUSTED_OVERLAY;
         mViewHost.setView(dividerView, lp);
         dividerView.setup(splitLayout, mViewHost, null /* dragListener */);
     }
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/DividerWindowManager.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/DividerWindowManager.java
index f2becc9..5078371 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/DividerWindowManager.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/DividerWindowManager.java
@@ -24,6 +24,7 @@
 import static android.view.WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
 import static android.view.WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;
 import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_NO_MOVE_ANIMATION;
+import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_TRUSTED_OVERLAY;
 import static android.view.WindowManager.LayoutParams.TYPE_DOCK_DIVIDER;
 import static android.view.WindowManager.SHELL_ROOT_LAYER_DIVIDER;
 
@@ -59,7 +60,7 @@
                 PixelFormat.TRANSLUCENT);
         mLp.token = new Binder();
         mLp.setTitle(WINDOW_TITLE);
-        mLp.privateFlags |= PRIVATE_FLAG_NO_MOVE_ANIMATION;
+        mLp.privateFlags |= PRIVATE_FLAG_NO_MOVE_ANIMATION | PRIVATE_FLAG_TRUSTED_OVERLAY;
         mLp.layoutInDisplayCutoutMode = LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS;
         view.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                 | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION