Fix the double-tap to click gesture in touch accessibility mode.

ash/ash_touch_exploration_manager_chromeos.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 "ash/ash_touch_exploration_manager_chromeos.h"
 
 #include "ash/accessibility_delegate.h"
 #include "ash/audio/sounds.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
@@ skipping 79 matching lines @@
       gesture);
 }
 
 void AshTouchExplorationManager::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
     aura::Window* gained_active,
     aura::Window* lost_active) {
   UpdateTouchExplorationState();
 }
 
+void AshTouchExplorationManager::SetTouchAccessibilityAnchorPoint(
+    const gfx::Point& anchor_point) {
+  if (touch_exploration_controller_) {
+    touch_exploration_controller_->SetTouchAccessibilityAnchorPoint(
+        anchor_point);
+  }
+}
+
 void AshTouchExplorationManager::UpdateTouchExplorationState() {
   // Comes from components/exo/shell_surface.cc.
   const char kExoShellSurfaceWindowName[] = "ExoShellSurface";
 
   // See crbug.com/603745 for more details.
   bool pass_through_surface =
       wm::GetActiveWindow() &&
       wm::GetActiveWindow()->name() == kExoShellSurfaceWindowName;
 
   AccessibilityDelegate* delegate =
       Shell::GetInstance()->accessibility_delegate();
   bool enabled = delegate->IsSpokenFeedbackEnabled();
 
   if (!pass_through_surface && enabled &&
       !touch_exploration_controller_.get()) {
     touch_exploration_controller_.reset(new ui::TouchExplorationController(
         root_window_controller_->GetRootWindow(), this));
   } else if (!enabled || pass_through_surface) {
     touch_exploration_controller_.reset();
   }
 }
 
 bool AshTouchExplorationManager::VolumeAdjustSoundEnabled() {
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(
       chromeos::switches::kDisableVolumeAdjustSound);
 }
 
 }  // namespace ash