Revert of Remove enable/disable wheel gestures setting.

content/browser/renderer_host/input/input_router_impl_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/browser/renderer_host/input/input_router_impl.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 152 matching lines @@
   void TearDown() override {
     // Process all pending tasks to avoid leaks.
     base::MessageLoop::current()->RunUntilIdle();
 
     input_router_.reset();
     client_.reset();
     process_.reset();
     browser_context_.reset();
   }
 
+  void SetUpForGestureBasedWheelScrolling(bool enabled) {
+    CHECK(!base::CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kDisableWheelGestures) &&
+          !base::CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kEnableWheelGestures));
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
+        enabled ? switches::kEnableWheelGestures
+                : switches::kDisableWheelGestures);
+    TearDown();
+    SetUp();
+  }
+
   void SetUpForTouchAckTimeoutTest(int desktop_timeout_ms,
                                    int mobile_timeout_ms) {
     config_.touch_config.desktop_touch_ack_timeout_delay =
         base::TimeDelta::FromMilliseconds(desktop_timeout_ms);
     config_.touch_config.mobile_touch_ack_timeout_delay =
         base::TimeDelta::FromMilliseconds(mobile_timeout_ms);
     config_.touch_config.touch_ack_timeout_supported = true;
     TearDown();
     SetUp();
     input_router()->NotifySiteIsMobileOptimized(false);
@@ skipping 745 matching lines @@
     expected_events.erase(expected_events.begin(),
                           expected_events.begin() + acked.size());
   }
 
   EXPECT_TRUE(TouchEventQueueEmpty());
   EXPECT_EQ(0U, expected_events.size());
 }
 #endif  // defined(USE_AURA)
 
 TEST_F(InputRouterImplTest, UnhandledWheelEvent) {
+  SetUpForGestureBasedWheelScrolling(false);
+
   // Simulate wheel events.
   SimulateWheelEvent(0, 0, 0, -5, 0, false);   // sent directly
   SimulateWheelEvent(0, 0, 0, -10, 0, false);  // enqueued
+
+  // Check that only the first event was sent.
+  EXPECT_TRUE(process_->sink().GetUniqueMessageMatching(
+                  InputMsg_HandleInputEvent::ID));
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+
+  // Indicate that the wheel event was unhandled.
+  SendInputEventACK(WebInputEvent::MouseWheel,
+                    INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  // Check that the correct unhandled wheel event was received.
+  EXPECT_EQ(1U, ack_handler_->GetAndResetAckCount());
+  EXPECT_EQ(INPUT_EVENT_ACK_STATE_NOT_CONSUMED, ack_handler_->ack_state());
+  EXPECT_EQ(ack_handler_->acked_wheel_event().deltaY, -5);
+
+  // Check that the second event was sent.
+  EXPECT_TRUE(process_->sink().GetUniqueMessageMatching(
+                  InputMsg_HandleInputEvent::ID));
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+
+  // Indicate that the wheel event was unhandled.
+  SendInputEventACK(WebInputEvent::MouseWheel,
+                    INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  // Check that the correct unhandled wheel event was received.
+  EXPECT_EQ(1U, ack_handler_->GetAndResetAckCount());
+  EXPECT_EQ(INPUT_EVENT_ACK_STATE_NOT_CONSUMED, ack_handler_->ack_state());
+  EXPECT_EQ(ack_handler_->acked_wheel_event().deltaY, -10);
+}
+
+TEST_F(InputRouterImplTest, UnhandledWheelEventWithGestureScrolling) {
+  SetUpForGestureBasedWheelScrolling(true);
+
+  // Simulate wheel events.
+  SimulateWheelEvent(0, 0, 0, -5, 0, false);   // sent directly
+  SimulateWheelEvent(0, 0, 0, -10, 0, false);  // enqueued
 
   // Check that only the first event was sent.
   EXPECT_TRUE(
       process_->sink().GetUniqueMessageMatching(InputMsg_HandleInputEvent::ID));
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
 
   // Indicate that the wheel event was unhandled.
   SendInputEventACK(WebInputEvent::MouseWheel,
                     INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
 
@@ skipping 1326 matching lines @@
   EXPECT_EQ(80, sent_event->data.flingStart.velocityY);
 
   const WebGestureEvent* filter_event =
       GetFilterWebInputEvent<WebGestureEvent>();
   TestLocationInFilterEvent(filter_event, orig);
   EXPECT_EQ(30, filter_event->data.flingStart.velocityX);
   EXPECT_EQ(40, filter_event->data.flingStart.velocityY);
 }
 
 }  // namespace content