diff --git a/services/core/java/com/android/server/input/InputWindowHandle.java b/services/core/java/com/android/server/input/InputWindowHandle.java
index 9a70f38..9149fcc 100644
--- a/services/core/java/com/android/server/input/InputWindowHandle.java
+++ b/services/core/java/com/android/server/input/InputWindowHandle.java
@@ -44,7 +44,6 @@
 
     // Window layout params attributes.  (WindowManager.LayoutParams)
     public int layoutParamsFlags;
-    public int layoutParamsPrivateFlags;
     public int layoutParamsType;
 
     // Dispatching timeout.
diff --git a/services/core/java/com/android/server/wm/DragState.java b/services/core/java/com/android/server/wm/DragState.java
index edc7c93..c6951bd 100644
--- a/services/core/java/com/android/server/wm/DragState.java
+++ b/services/core/java/com/android/server/wm/DragState.java
@@ -114,7 +114,6 @@
             mDragWindowHandle.inputChannel = mServerChannel;
             mDragWindowHandle.layer = getDragLayerLw();
             mDragWindowHandle.layoutParamsFlags = 0;
-            mDragWindowHandle.layoutParamsPrivateFlags = 0;
             mDragWindowHandle.layoutParamsType = WindowManager.LayoutParams.TYPE_DRAG;
             mDragWindowHandle.dispatchingTimeoutNanos =
                     WindowManagerService.DEFAULT_INPUT_DISPATCHING_TIMEOUT_NANOS;
diff --git a/services/core/java/com/android/server/wm/FakeWindowImpl.java b/services/core/java/com/android/server/wm/FakeWindowImpl.java
index c18ea01..1136ced 100644
--- a/services/core/java/com/android/server/wm/FakeWindowImpl.java
+++ b/services/core/java/com/android/server/wm/FakeWindowImpl.java
@@ -38,7 +38,7 @@
 
     public FakeWindowImpl(WindowManagerService service,
             Looper looper, InputEventReceiver.Factory inputEventReceiverFactory,
-            String name, int windowType, int layoutParamsFlags, int layoutParamsPrivateFlags,
+            String name, int windowType, int layoutParamsFlags,
             boolean canReceiveKeys, boolean hasFocus, boolean touchFullscreen) {
         mService = service;
 
@@ -61,7 +61,6 @@
         mWindowLayer = getLayerLw(windowType);
         mWindowHandle.layer = mWindowLayer;
         mWindowHandle.layoutParamsFlags = layoutParamsFlags;
-        mWindowHandle.layoutParamsPrivateFlags = layoutParamsPrivateFlags;
         mWindowHandle.layoutParamsType = windowType;
         mWindowHandle.dispatchingTimeoutNanos =
                 WindowManagerService.DEFAULT_INPUT_DISPATCHING_TIMEOUT_NANOS;
diff --git a/services/core/java/com/android/server/wm/InputMonitor.java b/services/core/java/com/android/server/wm/InputMonitor.java
index 46aefb6..0327cb3 100644
--- a/services/core/java/com/android/server/wm/InputMonitor.java
+++ b/services/core/java/com/android/server/wm/InputMonitor.java
@@ -168,8 +168,8 @@
     }
 
     private void addInputWindowHandleLw(final InputWindowHandle inputWindowHandle,
-            final WindowState child, int flags, int privateFlags, final int type,
-            final boolean isVisible, final boolean hasFocus, final boolean hasWallpaper) {
+            final WindowState child, int flags, final int type, final boolean isVisible,
+            final boolean hasFocus, final boolean hasWallpaper) {
         // Add a window to our list of input windows.
         inputWindowHandle.name = child.toString();
         final boolean modal = (flags & (WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
@@ -184,7 +184,6 @@
             child.getTouchableRegion(inputWindowHandle.touchableRegion);
         }
         inputWindowHandle.layoutParamsFlags = flags;
-        inputWindowHandle.layoutParamsPrivateFlags = privateFlags;
         inputWindowHandle.layoutParamsType = type;
         inputWindowHandle.dispatchingTimeoutNanos = child.getInputDispatchingTimeoutNanos();
         inputWindowHandle.visible = isVisible;
@@ -298,15 +297,14 @@
                     final WindowState u = universeBackground.mWin;
                     if (u.mInputChannel != null && u.mInputWindowHandle != null) {
                         addInputWindowHandleLw(u.mInputWindowHandle, u, u.mAttrs.flags,
-                                u.mAttrs.privateFlags, u.mAttrs.type,
-                                true, u == mInputFocus, false);
+                                u.mAttrs.type, true, u == mInputFocus, false);
                     }
                     addedUniverse = true;
                 }
 
                 if (child.mWinAnimator != universeBackground) {
-                    addInputWindowHandleLw(inputWindowHandle, child, flags, privateFlags, type,
-                            isVisible, hasFocus, hasWallpaper);
+                    addInputWindowHandleLw(inputWindowHandle, child, flags, type, isVisible,
+                            hasFocus, hasWallpaper);
                 }
             }
         }
diff --git a/services/core/java/com/android/server/wm/WindowAnimator.java b/services/core/java/com/android/server/wm/WindowAnimator.java
index c002ddf..82e4bb1 100644
--- a/services/core/java/com/android/server/wm/WindowAnimator.java
+++ b/services/core/java/com/android/server/wm/WindowAnimator.java
@@ -20,6 +20,7 @@
 import static android.view.WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;
 
 import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_KEYGUARD;
+import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_SYSTEM_ERROR;
 import static com.android.server.wm.WindowManagerService.DEBUG_KEYGUARD;
 import static com.android.server.wm.WindowManagerService.LayoutFields.SET_UPDATE_ROTATION;
 import static com.android.server.wm.WindowManagerService.LayoutFields.SET_WALLPAPER_MAY_CHANGE;
@@ -330,7 +331,9 @@
                             + " anim=" + win.mWinAnimator.mAnimation);
                 } else if (mPolicy.canBeForceHidden(win, win.mAttrs)) {
                     final boolean hideWhenLocked = !((win.mIsImWindow && showImeOverKeyguard) ||
-                            (appShowWhenLocked != null && appShowWhenLocked == win.mAppToken));
+                            (appShowWhenLocked != null && (appShowWhenLocked == win.mAppToken ||
+                                    // Show error dialogs over apps that dismiss keyguard.
+                                    (win.mAttrs.privateFlags & PRIVATE_FLAG_SYSTEM_ERROR) != 0)));
                     if (((mForceHiding == KEYGUARD_ANIMATING_IN)
                                 && (!winAnimator.isAnimating() || hideWhenLocked))
                             || ((mForceHiding == KEYGUARD_SHOWN) && hideWhenLocked)) {
diff --git a/services/core/java/com/android/server/wm/WindowManagerService.java b/services/core/java/com/android/server/wm/WindowManagerService.java
index 318ff0e..6cb1e4a 100644
--- a/services/core/java/com/android/server/wm/WindowManagerService.java
+++ b/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -10791,9 +10791,7 @@
             boolean canReceiveKeys, boolean hasFocus, boolean touchFullscreen) {
         synchronized (mWindowMap) {
             FakeWindowImpl fw = new FakeWindowImpl(this, looper, inputEventReceiverFactory,
-                    name, windowType,
-                    layoutParamsFlags, layoutParamsPrivateFlags, canReceiveKeys,
-                    hasFocus, touchFullscreen);
+                    name, windowType, layoutParamsFlags, canReceiveKeys, hasFocus, touchFullscreen);
             int i=0;
             while (i<mFakeWindows.size()) {
                 if (mFakeWindows.get(i).mWindowLayer <= fw.mWindowLayer) {
diff --git a/services/core/jni/com_android_server_input_InputWindowHandle.cpp b/services/core/jni/com_android_server_input_InputWindowHandle.cpp
index 03bf7eb..46ec1f4 100644
--- a/services/core/jni/com_android_server_input_InputWindowHandle.cpp
+++ b/services/core/jni/com_android_server_input_InputWindowHandle.cpp
@@ -36,7 +36,6 @@
     jfieldID inputChannel;
     jfieldID name;
     jfieldID layoutParamsFlags;
-    jfieldID layoutParamsPrivateFlags;
     jfieldID layoutParamsType;
     jfieldID dispatchingTimeoutNanos;
     jfieldID frameLeft;
@@ -113,8 +112,6 @@
 
     mInfo->layoutParamsFlags = env->GetIntField(obj,
             gInputWindowHandleClassInfo.layoutParamsFlags);
-    mInfo->layoutParamsPrivateFlags = env->GetIntField(obj,
-            gInputWindowHandleClassInfo.layoutParamsPrivateFlags);
     mInfo->layoutParamsType = env->GetIntField(obj,
             gInputWindowHandleClassInfo.layoutParamsType);
     mInfo->dispatchingTimeout = env->GetLongField(obj,
@@ -251,9 +248,6 @@
     GET_FIELD_ID(gInputWindowHandleClassInfo.layoutParamsFlags, clazz,
             "layoutParamsFlags", "I");
 
-    GET_FIELD_ID(gInputWindowHandleClassInfo.layoutParamsPrivateFlags, clazz,
-            "layoutParamsPrivateFlags", "I");
-
     GET_FIELD_ID(gInputWindowHandleClassInfo.layoutParamsType, clazz,
             "layoutParamsType", "I");