Implement form resubmission warning for Android.

chrome/android/java/src/org/chromium/chrome/browser/RepostFormWarningDialog.java

Index: chrome/android/java/src/org/chromium/chrome/browser/RepostFormWarningDialog.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/RepostFormWarningDialog.java b/chrome/android/java/src/org/chromium/chrome/browser/RepostFormWarningDialog.java
new file mode 100644
index 0000000000000000000000000000000000000000..31f2b55f548e90901406e65e50aa4bee245c151f
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/RepostFormWarningDialog.java
@@ -0,0 +1,76 @@
+// Copyright 2013 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;
+
+import java.lang.Runnable;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.DialogFragment;
+import android.content.DialogInterface;
+import android.os.Bundle;
+
+import org.chromium.chrome.R;
+
+/**
+ * Form resubmission warning dialog. Presents the cancel/continue choice and fires one of two
+ * callbacks accordingly.
+ */
+class RepostFormWarningDialog extends DialogFragment {
+    // Warning dialog currently being shown, stored for testing.
+    private static Dialog sCurrentDialog;
+
+    private final Runnable mCancelCallback;
+    private final Runnable mContinueCallback;
+
+    public RepostFormWarningDialog(Runnable cancelCallback, Runnable continueCallback) {
+        mCancelCallback = cancelCallback;
+        mContinueCallback = continueCallback;
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())
+                .setMessage(R.string.http_post_warning)
+                .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int id) {
+                        mCancelCallback.run();
+                    }
+                })
+                .setPositiveButton(R.string.http_post_warning_resend,
+                        new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int id) {
+                        mContinueCallback.run();
+                    }
+                });
+
+        assert getCurrentDialog() == null;
+        Dialog dialog = builder.create();
+        setCurrentDialog(dialog);
+
+        return dialog;
+    }
+
+    @Override
+    public void onDismiss(DialogInterface dialog) {
+        super.onDismiss(dialog);
+        setCurrentDialog(null);
+    }
+
+    /**
+     * Sets the currently displayed dialog in sCurrentDialog. This is required by findbugs, which
+     * allows static fields only to be set from static methods.
+     */
+    private static void setCurrentDialog(Dialog dialog) {
+        sCurrentDialog = dialog;
+    }
+
+    /**
+     * @return dialog currently being displayed.
+     */
+    public static Dialog getCurrentDialog() {
+        return sCurrentDialog;
+    }
+}