chromeos: Add ArcInputBridge to components/arc

components/arc/input/arc_input_bridge.h

Index: components/arc/input/arc_input_bridge.h
diff --git a/components/arc/input/arc_input_bridge.h b/components/arc/input/arc_input_bridge.h
new file mode 100644
index 0000000000000000000000000000000000000000..ecb83af124b6f28d8226d2c62a7a4f35baf91ef0
--- /dev/null
+++ b/components/arc/input/arc_input_bridge.h
@@ -0,0 +1,43 @@
+// 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(){};

[reveman, 2015/12/05 00:48:45]

nit: virtual ~ArcInputBridge() {}

[denniskempin, 2015/12/05 01:17:56]

Done.

+
+  // 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);

[reveman, 2015/12/05 00:48:45]

Not a huge fan of having a factory method when there's only one implementation.
I would just rename ArcInputBridgeImpl to ArcInputBridge and use the ctor
directly in ArcServiceManager. But I don't feel that strongly about this. If
this somehow matches a pattern used in components/arc then fine.

[denniskempin, 2015/12/05 01:17:56]

we would like to keep the includes from the implementation hidden from
service_manager so we do not have to add DEPS there.

+
+ protected:
+  ArcInputBridge(){};

[reveman, 2015/12/05 00:48:45]

nit: ArcInputBridge() {}

[denniskempin, 2015/12/05 01:17:56]

Done. For real this time.

+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ArcInputBridge);
+};
+
+}  // namespace arc
+
+#endif  // COMPONENTS_EXO_ARC_INPUT_ARC_INPUT_BRIDGE_H_