Re-land: Toggle spoken feedback if two fingers are held down.

ui/chromeos/touch_exploration_controller_unittest.cc

 // Copyright 2014 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.
 
 #include "ui/chromeos/touch_exploration_controller.h"
 
 #include <math.h>
 #include <stddef.h>
 
 #include <memory>
@@ skipping 280 matching lines @@
   void SuppressVLOGs(bool suppress) {
     touch_exploration_controller_->SuppressVLOGsForTesting(suppress);
   }
 
   void SwitchTouchExplorationMode(bool on) {
     if (!on && touch_exploration_controller_.get()) {
       touch_exploration_controller_.reset();
     } else if (on && !touch_exploration_controller_.get()) {
       touch_exploration_controller_.reset(
           new ui::TouchExplorationControllerTestApi(
-              new TouchExplorationController(root_window(), &delegate_)));
+              new TouchExplorationController(root_window(), &delegate_,
+                                             nullptr)));
       cursor_client()->ShowCursor();
       cursor_client()->DisableMouseEvents();
     }
   }
 
   void EnterTouchExplorationModeAtLocation(gfx::Point tap_location) {
     ui::TouchEvent touch_press(ui::ET_TOUCH_PRESSED, tap_location, 0, Now());
     generator_->Dispatch(&touch_press);
     AdvanceSimulatedTimePastTapDelay();
     EXPECT_TRUE(IsInTouchToMouseMode());
@@ skipping 1621 matching lines @@
     AdvanceSimulatedTimePastTapDelay();
     EXPECT_TRUE(IsInNoFingersDownState());
 
     ASSERT_EQ(1U, GetCapturedEvents().size());
     EXPECT_EQ(ui::ET_MOUSE_MOVED, GetCapturedEvents()[0]->type());
     ClearCapturedEvents();
   }
 }
 
 }  // namespace ui