Android Chromoting: Remove title and add navigation button to disconnect

remoting/android/java/src/org/chromium/chromoting/Desktop.java

 // 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.chromoting;
 
 import android.annotation.SuppressLint;
 import android.content.res.Configuration;
 import android.os.Build;
 import android.os.Bundle;
@@ skipping 33 matching lines @@
 
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.desktop);
         mRemoteHostDesktop = (DesktopView) findViewById(R.id.desktop_view);
         mOverlayButton = (ImageButton) findViewById(R.id.desktop_overlay_button);
         mRemoteHostDesktop.setDesktop(this);
 
-        // Ensure the button is initially hidden.
+        // For this Activity, the home button in the action bar acts as a Disconnect button, so
+        // set the description for accessibility/screen readers.
+        getSupportActionBar().setHomeActionContentDescription(R.string.disconnect_myself_button);
+
+        // Ensure the overlay button is initially hidden.
         showActionBar();
 
         View decorView = getWindow().getDecorView();
         decorView.setOnSystemUiVisibilityChangeListener(this);
 
         mActivityLifecycleListener = CapabilityManager.getInstance()
             .onActivityAcceptingListener(this, Capabilities.CAST_CAPABILITY);
         mActivityLifecycleListener.onActivityCreated(this, savedInstanceState);
     }
 
@@ skipping 121 matching lines @@
         mActivityLifecycleListener.onActivityOptionsItemSelected(this, item);
 
         if (id == R.id.actionbar_keyboard) {
             ((InputMethodManager) getSystemService(INPUT_METHOD_SERVICE)).toggleSoftInput(0, 0);
             return true;
         }
         if (id == R.id.actionbar_hide) {
             hideActionBar();
             return true;
         }
-        if (id == R.id.actionbar_disconnect) {
+        if (id == R.id.actionbar_disconnect || id == android.R.id.home) {
             JniInterface.disconnectFromHost();
             return true;
         }
         if (id == R.id.actionbar_send_ctrl_alt_del) {
             int[] keys = {
                 KeyEvent.KEYCODE_CTRL_LEFT,
                 KeyEvent.KEYCODE_ALT_LEFT,
                 KeyEvent.KEYCODE_FORWARD_DEL,
             };
             for (int key : keys) {
@@ skipping 79 matching lines @@
                 JniInterface.sendKeyEvent(KeyEvent.KEYCODE_SHIFT_LEFT, pressed);
                 JniInterface.sendKeyEvent(KeyEvent.KEYCODE_EQUALS, pressed);
                 return true;
 
             default:
                 // We try to send all other key codes to the host directly.
                 return JniInterface.sendKeyEvent(keyCode, pressed);
         }
     }
 }