Add EventForwarder for routing touch events

ui/android/event_forwarder.h

Index: ui/android/event_forwarder.h
diff --git a/ui/android/event_forwarder.h b/ui/android/event_forwarder.h
new file mode 100644
index 0000000000000000000000000000000000000000..9d9c2c0f9b4ed1cf9597226da1df60d62c1aee53
--- /dev/null
+++ b/ui/android/event_forwarder.h
@@ -0,0 +1,81 @@
+// 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_EVENT_FORWARDER_H_
+#define UI_ANDROID_EVENT_FORWARDER_H_
+
+#include "base/android/scoped_java_ref.h"
+
+namespace ui {
+
+class ViewAndroid;
+
+class EventForwarder {
+ public:
+  ~EventForwarder();
+
+  jboolean OnTouchEvent(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj,
+      const base::android::JavaParamRef<jobject>& motion_event,
+      jlong time_ms,
+      jint android_action,
+      jint pointer_count,
+      jint history_size,
+      jint action_index,
+      jfloat pos_x_0,
+      jfloat pos_y_0,
+      jfloat pos_x_1,
+      jfloat pos_y_1,
+      jint pointer_id_0,
+      jint pointer_id_1,
+      jfloat touch_major_0,
+      jfloat touch_major_1,
+      jfloat touch_minor_0,
+      jfloat touch_minor_1,
+      jfloat orientation_0,
+      jfloat orientation_1,
+      jfloat tilt_0,
+      jfloat tilt_1,
+      jfloat raw_pos_x,
+      jfloat raw_pos_y,
+      jint android_tool_type_0,
+      jint android_tool_type_1,
+      jint android_button_state,
+      jint android_meta_state,
+      jboolean is_touch_handle_event);
+
+  void OnMouseEvent(JNIEnv* env,
+                    const base::android::JavaParamRef<jobject>& obj,
+                    jlong time_ms,
+                    jint android_action,
+                    jfloat x,
+                    jfloat y,
+                    jint pointer_id,
+                    jfloat pressure,
+                    jfloat orientation,
+                    jfloat tilt,
+                    jint android_changed_button,
+                    jint android_button_state,
+                    jint android_meta_state,
+                    jint tool_type);
+
+ private:
+  friend class ViewAndroid;
+
+  explicit EventForwarder(ViewAndroid* view);
+
+  base::android::ScopedJavaLocalRef<jobject> GetJavaObject();
+
+  ViewAndroid* const view_;
+  base::android::ScopedJavaGlobalRef<jobject> java_obj_;
+
+  DISALLOW_COPY_AND_ASSIGN(EventForwarder);
+};
+
+bool RegisterEventForwarder(JNIEnv* env);
+
+}  // namespace ui
+
+#endif  // UI_ANDROID_EVENT_FORWARDER_H_