Fix overscroll getting kicked in on non-precise wheel scrolls

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

 // Copyright (c) 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/renderer_host/render_widget_host_view_aura.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <tuple>
@@ skipping 2850 matching lines @@
   press.set_location_f(gfx::PointF(kX, kY));
   press.set_root_location_f(gfx::PointF(kX, kY));
 
   view_->OnTouchEvent(&press);
   EXPECT_EQ(ui::MotionEvent::ACTION_DOWN, pointer_state().GetAction());
   EXPECT_EQ(1U, pointer_state().GetPointerCount());
   EXPECT_EQ(kX, pointer_state().GetX(0));
   EXPECT_EQ(kY, pointer_state().GetY(0));
 }
 
+TEST_F(RenderWidgetHostViewAuraOverscrollTest, WheelNotPreciseScrollEvent) {
+  SetUpOverscrollEnvironment();
+
+  // Simulate wheel events.
+  SimulateWheelEvent(-5, 0, 0, false);    // sent directly
+  SimulateWheelEvent(-60, 1, 0, false);    // enqueued
+  EXPECT_EQ(OVERSCROLL_NONE, overscroll_mode());
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+
+  // Receive ACK the first wheel event as not processed.
+  SendInputEventACK(WebInputEvent::MouseWheel,
+                    INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  // ScrollBegin, ScrollUpdate, MouseWheel will be queued events
+  EXPECT_EQ(3U, GetSentMessageCountAndResetSink());
+  SendInputEventACK(WebInputEvent::GestureScrollUpdate,
+                    INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  EXPECT_EQ(OVERSCROLL_NONE, overscroll_mode());
+  EXPECT_EQ(OVERSCROLL_NONE, overscroll_delegate()->current_mode());
+
+  SendInputEventACK(WebInputEvent::MouseWheel,
+                    INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+  // ScrollUpdate, MouseWheel will be queued events
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+  SendInputEventACK(WebInputEvent::GestureScrollUpdate,
+                    INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  EXPECT_EQ(OVERSCROLL_NONE, overscroll_mode());
+  EXPECT_EQ(OVERSCROLL_NONE, overscroll_delegate()->current_mode());
+}
+
 TEST_F(RenderWidgetHostViewAuraOverscrollTest, WheelScrollEventOverscrolls) {
   SetUpOverscrollEnvironment();
 
   // Simulate wheel events.
   SimulateWheelEvent(-5, 0, 0, true);    // sent directly
   SimulateWheelEvent(-1, 1, 0, true);    // enqueued
   SimulateWheelEvent(-10, -3, 0, true);  // coalesced into previous event
   SimulateWheelEvent(-15, -1, 0, true);  // coalesced into previous event
   SimulateWheelEvent(-30, -3, 0, true);  // coalesced into previous event
   SimulateWheelEvent(-20, 6, 1, true);   // enqueued, different modifiers
@@ skipping 1762 matching lines @@
 
     // Retrieve the selected text from clipboard and verify it is as expected.
     base::string16 result_text;
     clipboard->ReadText(ui::CLIPBOARD_TYPE_SELECTION, &result_text);
     EXPECT_EQ(expected_text, result_text);
   }
 }
 #endif
 
 }  // namespace content