Clear the state of scroll and selection onmouseup

third_party/WebKit/Source/core/input/EventHandlerTest.cpp

Index: third_party/WebKit/Source/core/input/EventHandlerTest.cpp
diff --git a/third_party/WebKit/Source/core/input/EventHandlerTest.cpp b/third_party/WebKit/Source/core/input/EventHandlerTest.cpp
index 2a0c6f72df8448d56f6be7b99aeb557f3c3df5bb..641ba710be21239cf25614faf122adb2c38c7ad7 100644
--- a/third_party/WebKit/Source/core/input/EventHandlerTest.cpp
+++ b/third_party/WebKit/Source/core/input/EventHandlerTest.cpp
@@ -9,6 +9,7 @@
 #include "core/dom/Range.h"
 #include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
+#include "core/editing/SelectionController.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
@@ -117,6 +118,12 @@ TEST_F(EventHandlerTest, dragSelectionAfterScroll) {
   GetDocument().GetFrame()->GetEventHandler().HandleMousePressEvent(
       mouse_down_event);
 
+  ASSERT_TRUE(GetDocument()
+                  .GetFrame()
+                  ->GetEventHandler()
+                  .GetSelectionController()
+                  .MouseDownMayStartSelect());
+
   WebMouseEvent mouse_move_event(
       WebInputEvent::kMouseMove, WebFloatPoint(100, 50),
       WebFloatPoint(200, 250), WebPointerProperties::Button::kLeft, 1,
@@ -139,6 +146,12 @@ TEST_F(EventHandlerTest, dragSelectionAfterScroll) {
   GetDocument().GetFrame()->GetEventHandler().HandleMouseReleaseEvent(
       mouse_up_event);
 
+  ASSERT_FALSE(GetDocument()
+                   .GetFrame()
+                   ->GetEventHandler()
+                   .GetSelectionController()
+                   .MouseDownMayStartSelect());
+
   ASSERT_TRUE(
       Selection().ComputeVisibleSelectionInDOMTreeDeprecated().IsRange());
   Range* range = CreateRange(Selection()