[DO NOT MERGE] Bring back overlay warning in permissions UI.

The package installer has a special event handling when
the user tries to interact with it and an overlay window
intersects the installer one. We show a warning that an
overlay was detected and point the user to settings. This
regressed and nothing happened when the users click the
allow button.

bug:28572707
bug:26677796

Change-Id: I617595e7cd5277576ccb9915946b77082a1c2b9e

Resolution to mnc-mr2-release when CP'ing ag/1065580

Change-Id: Ia4d603a88bb4d7c38ec9ecadad1f4eac9e697516
diff --git a/res/layout/grant_permissions.xml b/res/layout/grant_permissions.xml
index ffbd276..0f324e5 100644
--- a/res/layout/grant_permissions.xml
+++ b/res/layout/grant_permissions.xml
@@ -80,15 +80,17 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 style="?android:attr/buttonBarButtonStyle"
-                android:text="@string/grant_dialog_button_deny" />
+                android:text="@string/grant_dialog_button_deny" >
+            </Button>
 
-            <com.android.packageinstaller.permission.ui.SecureButtonView
+            <Button
                 android:id="@+id/permission_allow_button"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 style="?android:attr/buttonBarButtonStyle"
                 android:layout_marginStart="8dip"
-                android:text="@string/grant_dialog_button_allow" />
+                android:text="@string/grant_dialog_button_allow" >
+            </Button>
 
         </com.android.internal.widget.ButtonBarLayout>
 
diff --git a/src/com/android/packageinstaller/permission/ui/OverlayTouchActivity.java b/src/com/android/packageinstaller/permission/ui/OverlayTouchActivity.java
index e4cbff3..7b1d379 100644
--- a/src/com/android/packageinstaller/permission/ui/OverlayTouchActivity.java
+++ b/src/com/android/packageinstaller/permission/ui/OverlayTouchActivity.java
@@ -29,7 +29,8 @@
 
     @Override
     public boolean dispatchTouchEvent(MotionEvent event) {
-        mObscuredTouch = (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0;
+        mObscuredTouch = (event.getFlags() & (MotionEvent.FLAG_WINDOW_IS_OBSCURED
+                | MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED)) != 0;
         return super.dispatchTouchEvent(event);
     }
 
diff --git a/src/com/android/packageinstaller/permission/ui/SecureButtonView.java b/src/com/android/packageinstaller/permission/ui/SecureButtonView.java
deleted file mode 100644
index 624744e..0000000
--- a/src/com/android/packageinstaller/permission/ui/SecureButtonView.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright (C) 2016 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.packageinstaller.permission.ui;
-
-import android.content.Context;
-import android.util.AttributeSet;
-import android.view.MotionEvent;
-import android.widget.Button;
-
-/**
- * Extension of Button that uses the hidden MotionEvent flag for partially obscured windows to
- * prevent tapjacking attacks.
- */
-public class SecureButtonView extends Button {
-
-    public SecureButtonView(Context context) {
-        this(context, null);
-    }
-
-    public SecureButtonView(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
-    }
-
-    public SecureButtonView(Context context, AttributeSet attrs, int defStyleAttr) {
-        this(context, attrs, defStyleAttr, 0);
-    }
-
-    public SecureButtonView(Context context, AttributeSet attrs, int defStyleAttr,
-            int defStyleRes) {
-        super(context, attrs, defStyleAttr, defStyleRes);
-    }
-
-    @Override
-    public boolean onFilterTouchEventForSecurity(MotionEvent event) {
-        if ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0
-                || (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_PARTIALLY_OBSCURED) != 0) {
-            // Window is obscured, drop this touch.
-            return false;
-        }
-        return true;
-    }
-}