Add FLAG_SECURE for ChooseLockPassword and Pattern

Prevent ChooseLockPassword and ChooseLockPatten being projected to
remote views, add FLAG_SECURE for these screens.

Bug: 179725730
Test: Check these 2 screens not projected to chromecast
Test: robo test for SetupChooseLockPatternTest ChooseLockPatternTest
      SetupChooseLockPasswordTest ChooseLockPasswordTest
Change-Id: I7449a24427c966c1aa4280a7b7e7e70b60997cca

src/com/android/settings/password/ChooseLockPassword.java

@@ -69,6 +69,7 @@ import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
 import android.view.inputmethod.EditorInfo;
 import android.widget.ImeAwareEditText;
 import android.widget.TextView;
@@ -214,6 +215,7 @@ public class ChooseLockPassword extends SettingsActivity {
         ThemeHelper.trySetDynamicColor(this);
         super.onCreate(savedInstanceState);
         findViewById(R.id.content_parent).setFitsSystemWindows(false);
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
     }
 
     public static class ChooseLockPasswordFragment extends InstrumentedFragment

src/com/android/settings/password/ChooseLockPattern.java

@@ -41,6 +41,7 @@ import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
 import android.widget.TextView;
 
 import androidx.fragment.app.Fragment;
@@ -175,6 +176,7 @@ public class ChooseLockPattern extends SettingsActivity {
         ThemeHelper.trySetDynamicColor(this);
         super.onCreate(savedInstanceState);
         findViewById(R.id.content_parent).setFitsSystemWindows(false);
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
     }
 
     @Override

tests/robotests/src/com/android/settings/password/ChooseLockPasswordTest.java

@@ -27,6 +27,7 @@ import static android.app.admin.DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
 import static android.app.admin.DevicePolicyManager.PASSWORD_QUALITY_NUMERIC_COMPLEX;
 import static android.app.admin.DevicePolicyManager.PASSWORD_QUALITY_SOMETHING;
 import static android.app.admin.DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
+import static android.view.WindowManager.LayoutParams.FLAG_SECURE;
 
 import static com.android.internal.widget.LockPatternUtils.PASSWORD_TYPE_KEY;
 import static com.android.settings.password.ChooseLockGeneric.CONFIRM_CREDENTIALS;
@@ -158,6 +159,21 @@ public class ChooseLockPasswordTest {
                 .isNotNull();
     }
 
+    @Test
+    public void activity_shouldHaveSecureFlag() {
+        PasswordPolicy policy = new PasswordPolicy();
+        policy.quality = PASSWORD_QUALITY_ALPHABETIC;
+        policy.length = 10;
+
+        Intent intent = createIntentForPasswordValidation(
+                /* minMetrics */ policy.getMinMetrics(),
+                /* minComplexity= */ PASSWORD_COMPLEXITY_NONE,
+                /* passwordType= */ PASSWORD_QUALITY_ALPHABETIC);
+        ChooseLockPassword activity = buildChooseLockPasswordActivity(intent);
+        final int flags = activity.getWindow().getAttributes().flags;
+        assertThat(flags & FLAG_SECURE).isEqualTo(FLAG_SECURE);
+    }
+
     @Test
     public void processAndValidatePasswordRequirements_noMinPasswordComplexity() {
         PasswordPolicy policy = new PasswordPolicy();

tests/robotests/src/com/android/settings/password/ChooseLockPatternTest.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.password;
 
+import static android.view.WindowManager.LayoutParams.FLAG_SECURE;
+
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.common.truth.Truth.assertWithMessage;
 
@@ -107,6 +109,14 @@ public class ChooseLockPatternTest {
         assertThat(iconView.getVisibility()).isEqualTo(View.GONE);
     }
 
+    @Test
+    public void activity_shouldHaveSecureFlag() {
+        final ChooseLockPattern activity = Robolectric.buildActivity(
+                ChooseLockPattern.class, new IntentBuilder(application).build()).setup().get();
+        final int flags = activity.getWindow().getAttributes().flags;
+        assertThat(flags & FLAG_SECURE).isEqualTo(FLAG_SECURE);
+    }
+
     private ChooseLockPattern createActivity(boolean addFingerprintExtra) {
         return Robolectric.buildActivity(
                 ChooseLockPattern.class,