Add EventForwarder for routing touch events

content/browser/android/event_forwarder_impl.h

+// 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 CONTENT_BROWSER_ANDROID_EVENT_FORWARDER_IMPL_H_
+#define CONTENT_BROWSER_ANDROID_EVENT_FORWARDER_IMPL_H_
+
+#include "base/android/jni_android.h"
+
+namespace ui {
+class ViewAndroid;
+}
+
+namespace content {
+class RenderWidgetHostViewAndroid;
+class WebContentsImpl;
+
+class EventForwarderImpl {
+ public:
+  EventForwarderImpl(WebContentsImpl* web_contents);
+  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);
+
+ private:
+  ui::ViewAndroid* GetViewAndroid() const;
+  RenderWidgetHostViewAndroid* GetRenderWidgetHostViewAndroid() const;
+
+  // Reference to the current WebContents.
+  WebContentsImpl* web_contents_;
+  float dip_scale_;
+};
+
+bool RegisterEventForwarderImpl(JNIEnv* env);
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_EVENT_FORWARDER_IMPL_H_