Support longpress drag selection

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index f687931630d13362e870a52b05148dbc3da4b7a4..c480b201e88a190c70a0a1d838f0b7a6cfe31c3f 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -1330,12 +1330,6 @@ void RenderWidgetHostViewAndroid::OnSelectionEvent(
     ui::SelectionEventType event) {
   DCHECK(content_view_core_);
   DCHECK(selection_controller_);
-  // Showing the selection action bar can alter the current View coordinates in
-  // such a way that the current MotionEvent stream is suddenly shifted in
-  // space. Avoid the associated scroll jump by pre-emptively cancelling gesture
-  // detection; scrolling after the selection is activated is unnecessary.
-  if (event == ui::SelectionEventType::SELECTION_SHOWN)
-    ResetGestureDetection();
   content_view_core_->OnSelectionEvent(
       event, selection_controller_->GetStartPosition(),
       GetSelectionRect(*selection_controller_));
@@ -1653,15 +1647,13 @@ void RenderWidgetHostViewAndroid::GestureEventAck(
 InputEventAckState RenderWidgetHostViewAndroid::FilterInputEvent(
     const blink::WebInputEvent& input_event) {
   if (selection_controller_) {
-    switch (input_event.type) {
-      case blink::WebInputEvent::GestureLongPress:
-        selection_controller_->OnLongPressEvent();
-        break;
-      case blink::WebInputEvent::GestureTap:
-        selection_controller_->OnTapEvent();
-        break;
-      default:
-        break;
+    if (input_event.type == blink::WebInputEvent::GestureLongPress) {
+      const blink::WebGestureEvent& longpress =
+          static_cast<const blink::WebGestureEvent&>(input_event);
+      selection_controller_->OnLongPressEvent(
+          gfx::PointF(longpress.x, longpress.y));
+    } else if (input_event.type == blink::WebInputEvent::GestureTap) {
+      selection_controller_->OnTapEvent();
     }
   }