chromeos: Add ArcInputBridge to components/arc

components/arc/input/arc_input_bridge.h

+// Copyright 2015 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.
+
+#ifndef COMPONENTS_EXO_ARC_INPUT_ARC_INPUT_BRIDGE_H_
+#define COMPONENTS_EXO_ARC_INPUT_ARC_INPUT_BRIDGE_H_
+
+#include "base/macros.h"
+#include "components/arc/arc_bridge_service.h"
+
+namespace arc {
+
+class ArcBridgeService;
+
+// The ArcInputBridge is responsible for sending input events from ARC windows
+// to the ARC instance.
+// It hooks into aura::Env to watch for ExoSurface windows that are running ARC
+// applications. On those windows the input bridge will attach an EventPreTarget
+// to capture all input events.
+// To send those events to the ARC instance it will create bridge input devices
+// through the ArcBridgeService, which will provide a file descriptor to which
+// we can send linux input_event's.
+// ui::Events to the ARC windows are translated to linux input_event's, which
+// are then sent through the respective file descriptor.
+class ArcInputBridge {
+ public:
+  virtual ~ArcInputBridge() {}
+
+  // Creates a new instance of ArcInputBridge. It will register an Observer
+  // with aura::Env and the ArcBridgeService.
+  static scoped_ptr<ArcInputBridge> Create(
+      ArcBridgeService* arc_bridge_service);
+
+ protected:
+  ArcInputBridge() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ArcInputBridge);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_EXO_ARC_INPUT_ARC_INPUT_BRIDGE_H_