Stop negating the overscroll velocity to enable the glow of main thread fling

content/renderer/render_widget_unittest.cc

 // Copyright 2013 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/renderer/render_widget.h"
 
 #include <tuple>
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 256 matching lines @@
                           blink::WebFloatSize(10, 5));
   ASSERT_EQ(1u, widget()->sink()->message_count());
   const IPC::Message* message = widget()->sink()->GetMessageAt(0);
   ASSERT_EQ(InputHostMsg_DidOverscroll::ID, message->type());
   InputHostMsg_DidOverscroll::Param params;
   InputHostMsg_DidOverscroll::Read(message, &params);
   const ui::DidOverscrollParams& overscroll = std::get<0>(params);
   EXPECT_EQ(gfx::Vector2dF(10, 5), overscroll.latest_overscroll_delta);
   EXPECT_EQ(gfx::Vector2dF(5, 5), overscroll.accumulated_overscroll);
   EXPECT_EQ(gfx::PointF(1, 1), overscroll.causal_event_viewport_point);
-  EXPECT_EQ(gfx::Vector2dF(-10, -5), overscroll.current_fling_velocity);
+  EXPECT_EQ(gfx::Vector2dF(10, 5), overscroll.current_fling_velocity);
   widget()->sink()->ClearMessages();
 }
 
 TEST_F(RenderWidgetUnittest, RenderWidgetInputEventUmaMetrics) {
   SyntheticWebTouchEvent touch;
   touch.PressPoint(10, 10);
   touch.touchStartOrFirstTouchMove = true;
 
   EXPECT_CALL(*widget()->mock_webwidget(), handleInputEvent(_))
       .Times(5)
@@ skipping 72 matching lines @@
                                       2);
 
   touch.MovePoint(0, 30, 30);
   touch.touchStartOrFirstTouchMove = false;
   widget()->SendInputEvent(touch);
   histogram_tester().ExpectTotalCount("Event.Touch.TouchLatencyOutsideFling",
                                       2);
 }
 
 }  // namespace content