Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java

Index: chrome/android/java_staging/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java
diff --git a/chrome/android/java_staging/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java b/chrome/android/java_staging/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java
new file mode 100644
index 0000000000000000000000000000000000000000..565c1244c08c691e2f555caa1648ac6e9f16c119
--- /dev/null
+++ b/chrome/android/java_staging/src/org/chromium/chrome/browser/preferences/DocumentModePreference.java
@@ -0,0 +1,136 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.preferences;
+
+import android.annotation.TargetApi;
+import android.app.ActivityManager;
+import android.app.ActivityManager.AppTask;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import android.os.Bundle;
+import android.preference.Preference;
+import android.preference.Preference.OnPreferenceChangeListener;
+import android.preference.PreferenceFragment;
+import android.preference.SwitchPreference;
+import android.support.v7.app.AlertDialog;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.base.metrics.RecordUserAction;
+import org.chromium.chrome.browser.IntentHandler;
+import org.chromium.chrome.browser.document.DocumentActivity;
+import org.chromium.chrome.browser.document.DocumentMigrationHelper;
+import org.chromium.chrome.browser.document.DocumentUtils;
+
+import java.util.List;
+
+/**
+ * A preference to control whether user's tabs are appearing in the tab switcher.
+ */
+public class DocumentModePreference extends PreferenceFragment {
+
+    private static final String PREF_DOCUMENT_MODE_SWITCH = "document_mode_switch";
+    private SwitchPreference mDocumentModeSwitch;
+    private DocumentModeManager mDocumentModeManager;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        addPreferencesFromResource(R.xml.document_mode_preferences);
+        getActivity().setTitle(R.string.tabs_and_apps_title);
+
+        mDocumentModeManager = DocumentModeManager.getInstance(getActivity());
+
+        mDocumentModeSwitch = (SwitchPreference) findPreference(PREF_DOCUMENT_MODE_SWITCH);
+
+        boolean isdocumentModeEnabled = !mDocumentModeManager.isOptedOutOfDocumentMode();
+        mDocumentModeSwitch.setChecked(isdocumentModeEnabled);
+
+        mDocumentModeSwitch.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
+            @Override
+            public boolean onPreferenceChange(Preference preference, Object newValue) {
+                if ((boolean) newValue == !mDocumentModeManager.isOptedOutOfDocumentMode()) {
+                    return true;
+                }
+                createOptOutAlertDialog((boolean) newValue).show();
+                return true;
+            }
+        });
+    }
+
+    private AlertDialog createOptOutAlertDialog(final boolean optOut) {
+        final boolean isSwitchEnabled = !mDocumentModeManager.isOptedOutOfDocumentMode();
+
+        AlertDialog dialog = new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
+                .setTitle(optOut ? R.string.tabs_and_apps_turn_on_title
+                        : R.string.tabs_and_apps_turn_off_title)
+                .setMessage(optOut ? R.string.tabs_and_apps_opt_in_confirmation
+                        : R.string.tabs_and_apps_opt_out_confirmation)
+                .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int id) {
+                        mDocumentModeSwitch.setChecked(isSwitchEnabled);
+                        dialog.dismiss();
+                    }
+                })
+                .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        dialog.dismiss();
+                        if (optOut) {
+                            RecordUserAction.record("DocumentActivity_UserOptOut");
+                        } else {
+                            RecordUserAction.record("DocumentActivity_UserOptIn");
+                        }
+                        mDocumentModeManager.setOptedOutState(optOut
+                                ? DocumentModeManager.OPT_OUT_PROMO_DISMISSED
+                                : DocumentModeManager.OPTED_OUT_OF_DOCUMENT_MODE);
+                        mDocumentModeManager.setOptOutCleanUpPending(true);
+                        DocumentMigrationHelper.migrateTabs(
+                                optOut, getActivity(), isRestartNeeded(optOut));
+                    }
+                })
+                .setOnCancelListener(new DialogInterface.OnCancelListener() {
+                    @Override
+                    public void onCancel(DialogInterface dialog) {
+                        mDocumentModeSwitch.setChecked(isSwitchEnabled);
+                    }
+                })
+                .create();
+
+        return dialog;
+    }
+
+    /**
+     * Figure out whether we need to restart the application after the tab migration is complete.
+     * We don't need to restart if this is being accessed from FRE and no document activities have
+     * been created yet.
+     * @param optOut This is true when we are starting out in opted-out mode.
+     * @return Whether to restart the application.
+     */
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    private boolean isRestartNeeded(boolean optOut) {
+        if (optOut) return true;
+        boolean isFromFre = getActivity().getIntent() != null
+                && getActivity().getIntent().getBooleanExtra(
+                      IntentHandler.EXTRA_INVOKED_FROM_FRE, false);
+        if (!isFromFre) return true;
+
+        ActivityManager am = (ActivityManager) getActivity().getSystemService(
+                Context.ACTIVITY_SERVICE);
+        PackageManager pm = getActivity().getPackageManager();
+        List<AppTask> taskList = am.getAppTasks();
+
+        for (int i = 0; i < taskList.size(); i++) {
+            String className = DocumentUtils.getTaskClassName(taskList.get(i), pm);
+            if (className == null) continue;
+            if (DocumentActivity.isDocumentActivity(className)) return true;
+        }
+        return false;
+    }
+
+}