Add a one-time notice about other forms of browsing history.

chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/OtherFormsOfHistoryDialogFragment.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/OtherFormsOfHistoryDialogFragment.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/OtherFormsOfHistoryDialogFragment.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/OtherFormsOfHistoryDialogFragment.java
new file mode 100644
index 0000000000000000000000000000000000000000..e0d3a4fcc71cf4f981c33063159ac969c075e2c0
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/OtherFormsOfHistoryDialogFragment.java
@@ -0,0 +1,133 @@
+// Copyright 2016 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.privacy;
+
+import android.app.Activity;
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.support.v7.app.AlertDialog;
+import android.text.SpannableString;
+import android.text.method.LinkMovementMethod;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.TextView;
+
+import org.chromium.base.VisibleForTesting;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.tabmodel.TabModel.TabLaunchType;
+import org.chromium.chrome.browser.tabmodel.document.TabDelegate;
+import org.chromium.ui.text.NoUnderlineClickableSpan;
+import org.chromium.ui.text.SpanApplier;
+
+/**
+ * Informs the user about the existence of other forms of browsing history.
+ */
+public class OtherFormsOfHistoryDialogFragment extends DialogFragment implements
+        DialogInterface.OnClickListener {
+
+    public static final String PREF_OTHER_FORMS_OF_HISTORY_DIALOG_SHOWN =
+            "org.chromium.chrome.browser.preferences.privacy."
+            + "PREF_OTHER_FORMS_OF_HISTORY_DIALOG_SHOWN";
+
+    /** The my activity URL. */
+    private static final String WEB_HISTORY_URL =
+            "https://history.google.com/history/?utm_source=chrome_n";
+
+    private static final String TAG = "OtherFormsOfHistoryDialogFragment";
+
+    /**
+     * Create and show the dialog.
+     */
+    public static OtherFormsOfHistoryDialogFragment show(Activity activity) {
+        OtherFormsOfHistoryDialogFragment dialog = new OtherFormsOfHistoryDialogFragment();
+        dialog.show(activity.getFragmentManager(), TAG);
+        return dialog;
+    }
+
+    private OtherFormsOfHistoryDialogFragment() {
+        super();
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        super.onCreateDialog(savedInstanceState);
+        LayoutInflater inflater = getActivity().getLayoutInflater();
+        View view = inflater.inflate(R.layout.other_forms_of_history_dialog, null);
+
+        // Linkify the <link></link> span in the dialog text.
+        TextView textView = (TextView) view.findViewById(R.id.text);
+        final SpannableString textWithLink = SpanApplier.applySpans(
+                textView.getText().toString(),
+                new SpanApplier.SpanInfo("<link>", "</link>", new NoUnderlineClickableSpan() {
+                    @Override
+                    public void onClick(View widget) {
+                        new TabDelegate(false /* incognito */).launchUrl(
+                                WEB_HISTORY_URL, TabLaunchType.FROM_CHROME_UI);
+                    }
+                }));
+
+        textView.setText(textWithLink);
+        textView.setMovementMethod(LinkMovementMethod.getInstance());
+
+        // Construct the dialog.
+        AlertDialog dialog = new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
+                .setView(view)
+                .setTitle(R.string.clear_browsing_data_history_dialog_title)
+                .setPositiveButton(
+                        R.string.ok_got_it, this)
+                .create();
+
+        dialog.setCanceledOnTouchOutside(false);
+        return dialog;
+    }
+
+    @Override
+    public void onClick(DialogInterface dialog, int which) {
+        assert which == AlertDialog.BUTTON_POSITIVE;
+
+        // Remember that the dialog about other forms of browsing history has been shown
+        // to the user.
+        recordDialogWasShown(getActivity(), true);
+
+        // Finishes the ClearBrowsingDataPreferences activity that created this dialog.
+        getActivity().finish();
+    }
+
+    /**
+     * Sets the preference indicating whether this dialog was already shown.
+     * @param activity The Activity storing the preference.
+     * @param shown Whether the dialog was shown.
+     */
+    private static void recordDialogWasShown(Activity activity, boolean shown) {
+        SharedPreferences preferences =
+                PreferenceManager.getDefaultSharedPreferences(activity);
+        SharedPreferences.Editor editor = preferences.edit();
+        editor.putBoolean(PREF_OTHER_FORMS_OF_HISTORY_DIALOG_SHOWN, shown);
+        editor.apply();
+    }
+
+    /**
+     * @return Whether the dialog has already been shown to the user before.
+     */
+    static boolean wasDialogShown(Context context) {
+        return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(
+                PREF_OTHER_FORMS_OF_HISTORY_DIALOG_SHOWN, false);
+    }
+
+    /**
+     * For testing purposes, resets the preference indicating that this dialog has been shown
+     * to false.
+     * @param activity The Activity storing the preference.
+     */
+    @VisibleForTesting
+    static void clearShownPreferenceForTesting(Activity activity) {
+        recordDialogWasShown(activity, false);
+    }
+}