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 dc4df92d7e2d28820ae34f3511e6bf558ea618e5..f1315023e3332004010b7cafe6c0e8488c84d030 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -782,13 +782,20 @@ bool RenderWidgetHostViewAndroid::OnTouchHandleEvent(
 void RenderWidgetHostViewAndroid::ResetGestureDetection() {
   const ui::MotionEvent* current_down_event =
       gesture_provider_.GetCurrentDownEvent();
-  if (current_down_event) {
-    scoped_ptr<ui::MotionEvent> cancel_event = current_down_event->Cancel();
-    OnTouchEvent(*cancel_event);
+  if (!current_down_event) {
+    // A hard reset ensures prevention of any timer-based events that might fire
+    // after a touch sequence has ended.
+    gesture_provider_.ResetDetection();
+    return;
   }
 
-  // A hard reset ensures prevention of any timer-based events.
-  gesture_provider_.ResetDetection();
+  scoped_ptr<ui::MotionEvent> cancel_event = current_down_event->Cancel();
+  if (gesture_provider_.OnTouchEvent(*cancel_event).succeeded) {
+    bool causes_scrolling = false;
+    host_->ForwardTouchEventWithLatencyInfo(
+        ui::CreateWebTouchEventFromMotionEvent(*cancel_event, causes_scrolling),
+        ui::LatencyInfo());
+  }
 }
 
 void RenderWidgetHostViewAndroid::OnDidNavigateMainFrameToNewPage() {
@@ -1263,12 +1270,12 @@ 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)
+  // If a selection drag has started, it has taken over the active touch
+  // sequence. Immediately cancel gesture detection and any downstream touch
+  // listeners (e.g., web content) to communicate this transfer.
+  if (event == ui::SELECTION_DRAG_STARTED)
     ResetGestureDetection();
+
   content_view_core_->OnSelectionEvent(
       event, selection_controller_->GetStartPosition(),
       GetSelectionRect(*selection_controller_));
@@ -1583,15 +1590,15 @@ 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(
+          base::TimeTicks() +
+              base::TimeDelta::FromSecondsD(input_event.timeStampSeconds),
+          gfx::PointF(longpress.x, longpress.y));
+    } else if (input_event.type == blink::WebInputEvent::GestureTap) {
+      selection_controller_->OnTapEvent();
     }
   }