Add EventForwarder for routing touch events

ui/android/view_client.h

Index: ui/android/view_client.h
diff --git a/ui/android/view_client.h b/ui/android/view_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..149cc75bc5a606bbf7a17775513d08f326506f46
--- /dev/null
+++ b/ui/android/view_client.h
@@ -0,0 +1,29 @@
+// 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.
+
+#ifndef UI_ANDROID_VIEW_CLIENT_H_
+#define UI_ANDROID_VIEW_CLIENT_H_
+
+#include <jni.h>
+
+#include "ui/android/ui_android_export.h"
+#include "ui/events/android/motion_event_android.h"

[boliu, 2017/02/27 19:21:57]

forward declare is enough

[Jinsuk Kim, 2017/02/28 06:56:04]

Done.

+
+namespace ui {
+
+// Client interface used to forward events from Java to native views.
+// Calls are dispatched to its children along the hierarchy of ViewAndroid.
+// Use bool return type to stop propagating the call i.e. overriden method
+// should return true to indicate that the event was handled and stop
+// the processing.
+class UI_ANDROID_EXPORT ViewClient {
+ public:
+  virtual bool OnTouchEvent(const MotionEventAndroid& event,
+                            bool is_touch_handle_event);
+  virtual bool OnMouseEvent(const MotionEventAndroid& event, int action_button);
+};
+
+}  // namespace ui
+
+#endif  // UI_ANDROID_VIEW_CLIENT_H_