Mousewhell on Chrome Android can scroll vertically and horizontally

content/browser/android/content_view_core_impl.cc

 // Copyright 2012 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.
 
 #include "content/browser/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 936 matching lines @@
 
   rwhv->SendMouseEvent(event);
   return true;
 }
 
 jboolean ContentViewCoreImpl::SendMouseWheelEvent(JNIEnv* env,
                                                   jobject obj,
                                                   jlong time_ms,
                                                   jfloat x,
                                                   jfloat y,
-                                                  jfloat vertical_axis) {
+                                                  jfloat vertical_axis,
+                                                  jfloat horizontal_axis) {
   RenderWidgetHostViewAndroid* rwhv = GetRenderWidgetHostViewAndroid();
   if (!rwhv)
     return false;
 
   WebMouseWheelEventBuilder::Direction direction;
   if (vertical_axis > 0) {
     direction = WebMouseWheelEventBuilder::DIRECTION_UP;
   } else if (vertical_axis < 0) {
     direction = WebMouseWheelEventBuilder::DIRECTION_DOWN;
+  } else if (horizontal_axis > 0) {
+    direction = WebMouseWheelEventBuilder::DIRECTION_RIGHT;
+  } else if (horizontal_axis < 0) {
+    direction = WebMouseWheelEventBuilder::DIRECTION_LEFT;
   } else {
     return false;
   }
   blink::WebMouseWheelEvent event = WebMouseWheelEventBuilder::Build(
       direction, time_ms / 1000.0, x / dpi_scale(), y / dpi_scale());
 
   rwhv->SendMouseWheelEvent(event);
   return true;
 }
 
@@ skipping 370 matching lines @@
       reinterpret_cast<ui::WindowAndroid*>(window_android),
       retained_objects_set);
   return reinterpret_cast<intptr_t>(view);
 }
 
 bool RegisterContentViewCore(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content