Expand Chrome OS ARC support to create one tree source per package

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

Index: chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.h
diff --git a/chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.h b/chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.h
index 1cc84f927adfd69f38ac00b08f674971545c3018..b8c2fba951d20cb9b720d41f6b911561b3499f7e 100644
--- a/chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.h
+++ b/chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.h
@@ -7,6 +7,8 @@
 
 #include <memory>
 
+#include "chrome/browser/chromeos/arc/accessibility/ax_tree_source_arc.h"
+#include "chrome/browser/ui/app_list/arc/arc_app_list_prefs.h"
 #include "components/arc/arc_service.h"
 #include "components/arc/common/accessibility_helper.mojom.h"
 #include "components/arc/instance_holder.h"
@@ -33,7 +35,8 @@ class ArcAccessibilityHelperBridge
       public mojom::AccessibilityHelperHost,
       public InstanceHolder<mojom::AccessibilityHelperInstance>::Observer,
       public exo::WMHelper::ActivationObserver,
-      public ui::AXHostDelegate {
+      public AXTreeSourceArc::Delegate,
+      public ArcAppListPrefs::Observer {
  public:
   explicit ArcAccessibilityHelperBridge(ArcBridgeService* bridge_service);
   ~ArcAccessibilityHelperBridge() override;
@@ -48,18 +51,27 @@ class ArcAccessibilityHelperBridge
   void OnAccessibilityEvent(
       mojom::AccessibilityEventDataPtr event_data) override;
 
+  // AXTreeSourceArc::Delegate overrides.
+  void OnAction(const ui::AXActionData& data) const override;
+
  private:
   // exo::WMHelper::ActivationObserver overrides.
   void OnWindowActivated(aura::Window* gained_active,
                          aura::Window* lost_active) override;
 
-  // AXHostDelegate overrides.
-  void PerformAction(const ui::AXActionData& data) override;
+  // ArcAppListPrefs::Observer overrides.
+  void OnTaskCreated(int task_id,
+                     const std::string& package_name,
+                     const std::string& activity,
+                     const std::string& intent) override;
+  void OnTaskDestroyed(int task_id) override;
+  void OnTaskSetActive(int32_t task_id) override;
 
   mojo::Binding<mojom::AccessibilityHelperHost> binding_;
 
-  std::unique_ptr<AXTreeSourceArc> tree_source_;
-  std::unique_ptr<views::View> focus_stealer_;
+  std::map<std::string, std::unique_ptr<AXTreeSourceArc>> package_name_to_tree_;
+  std::map<std::string, std::set<int32_t>> package_name_to_task_ids_;
+  int32_t current_task_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcAccessibilityHelperBridge);
 };