Changed Blimp IME to use PopUp

blimp/client/app/android/java/src/org/chromium/blimp/input/ImeEditText.java

Index: blimp/client/app/android/java/src/org/chromium/blimp/input/ImeEditText.java
diff --git a/blimp/client/app/android/java/src/org/chromium/blimp/input/ImeEditText.java b/blimp/client/app/android/java/src/org/chromium/blimp/input/ImeEditText.java
new file mode 100644
index 0000000000000000000000000000000000000000..3aeb14d120ac08550458059cc86c97ea20947b94
--- /dev/null
+++ b/blimp/client/app/android/java/src/org/chromium/blimp/input/ImeEditText.java
@@ -0,0 +1,43 @@
+// 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.blimp.input;
+
+import android.content.Context;
+import android.support.v7.app.AlertDialog;
+import android.util.AttributeSet;
+import android.view.KeyEvent;
+import android.widget.EditText;
+
+/**
+ * A {@link EditText} contained in a dialog which allows users to enter text.
+ * The dialog is dismissed on pressing back button.
+ */
+public class ImeEditText extends EditText {
+    // The alert dialog that contains this text box.
+    private AlertDialog mParentDialog;
+
+    public ImeEditText(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    /**
+     * Sets the parent view for this view.
+     * @param dialog The dialog containing this view.
+     */
+    public void initialize(AlertDialog dialog) {
+        mParentDialog = dialog;
+    }
+
+    /**
+     * Dismiss the text input dialog as soon as back button is pressed.
+     */
+    @Override
+    public boolean dispatchKeyEventPreIme(KeyEvent event) {
+        if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
+            mParentDialog.dismiss();
+        }
+        return super.dispatchKeyEventPreIme(event);
+    }
+}