Initial support for native accessibility in ARC

chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.cc

 // Copyright 2017 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 "chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.h"
 
+#include "base/command_line.h"
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
+#include "chrome/browser/chromeos/arc/accessibility/ax_tree_source_arc.h"
+#include "chromeos/chromeos_switches.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/exo/wm_helper.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace arc {
 
 ArcAccessibilityHelperBridge::ArcAccessibilityHelperBridge(
     ArcBridgeService* bridge_service)
     : ArcService(bridge_service), binding_(this) {
   arc_bridge_service()->accessibility_helper()->AddObserver(this);
+
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          chromeos::switches::kEnableChromeVoxArcSupport))
+    tree_.reset(new AXTreeSourceArc());
 }
 
 ArcAccessibilityHelperBridge::~ArcAccessibilityHelperBridge() {
   arc_bridge_service()->accessibility_helper()->RemoveObserver(this);
 }
 
 void ArcAccessibilityHelperBridge::OnInstanceReady() {
   auto* instance = ARC_GET_INSTANCE_FOR_METHOD(
       arc_bridge_service()->accessibility_helper(), Init);
   DCHECK(instance);
   instance->Init(binding_.CreateInterfacePtrAndBind());
 }
 
 void ArcAccessibilityHelperBridge::OnAccessibilityEvent(
-    mojom::AccessibilityEventType event_type,
-    mojom::AccessibilityNodeInfoDataPtr event_source) {
-  if (event_type != mojom::AccessibilityEventType::VIEW_FOCUSED ||
-      event_source.is_null()) {
-    return;
-  }
-
-  chromeos::AccessibilityManager* accessibility_manager =
-      chromeos::AccessibilityManager::Get();
-
-  if (!accessibility_manager ||
-      !accessibility_manager->IsFocusHighlightEnabled()) {
-    return;
-  }
-
-  exo::WMHelper* wmHelper = exo::WMHelper::GetInstance();
-
-  aura::Window* focused_window = wmHelper->GetFocusedWindow();
-  if (!focused_window)
-    return;
-
-  aura::Window* toplevel_window = focused_window->GetToplevelWindow();
-
-  gfx::Rect bounds_in_screen = gfx::ScaleToEnclosingRect(
-      event_source.get()->boundsInScreen,
-      1.0f / toplevel_window->layer()->device_scale_factor());
-
-  accessibility_manager->OnViewFocusedInArc(bounds_in_screen);
+    mojom::AccessibilityEventDataPtr event_data) {
+  if (tree_)
+    tree_->NotifyAccessibilityEvent(event_data.get());
 }
 
 }  // namespace arc