[Android] Reland "Provide unhandled tap event notifications"

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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/renderer_host/input/gesture_event_queue.h"
 #include "content/browser/renderer_host/input/input_router_client.h"
@@ skipping 1261 matching lines @@
   PressTouchPoint(1, 1);
   SendTouchEvent();
 
   // First tap.
   EXPECT_EQ(2U, GetSentMessageCountAndResetSink());
   SimulateGestureEvent(WebInputEvent::GestureTapDown,
                        WebGestureEvent::Touchscreen);
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
 
   // The GestureTapUnconfirmed is converted into a tap, as the touch action is
-  // auto.
+  // none.
   SimulateGestureEvent(WebInputEvent::GestureTapUnconfirmed,
                        WebGestureEvent::Touchscreen);
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+  // This test will become invalid if GestureTap stops requiring an ack.
+  ASSERT_FALSE(WebInputEventTraits::IgnoresAckDisposition(
+      GetEventWithType(WebInputEvent::GestureTap)));
+  EXPECT_EQ(2, client_->in_flight_event_count());
+  SendInputEventACK(WebInputEvent::GestureTap,
+                    INPUT_EVENT_ACK_STATE_CONSUMED);
+  EXPECT_EQ(1, client_->in_flight_event_count());
 
   // This tap gesture is dropped, since the GestureTapUnconfirmed was turned
   // into a tap.
   SimulateGestureEvent(WebInputEvent::GestureTap, WebGestureEvent::Touchscreen);
   EXPECT_EQ(0U, GetSentMessageCountAndResetSink());
 
   SendInputEventACK(WebInputEvent::TouchEnd, INPUT_EVENT_ACK_STATE_CONSUMED);
   SendInputEventACK(WebInputEvent::TouchStart,
                     INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS);
 
   // Second Tap.
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
   SimulateGestureEvent(WebInputEvent::GestureTapDown,
                        WebGestureEvent::Touchscreen);
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
 
   // Although the touch-action is now auto, the double tap still won't be
   // dispatched, because the first tap occured when the touch-action was none.
   SimulateGestureEvent(WebInputEvent::GestureDoubleTap,
                        WebGestureEvent::Touchscreen);
   // This test will become invalid if GestureDoubleTap stops requiring an ack.
-  DCHECK(!WebInputEventTraits::IgnoresAckDisposition(
-             GetEventWithType(WebInputEvent::GestureDoubleTap)));
+  ASSERT_FALSE(WebInputEventTraits::IgnoresAckDisposition(
+      GetEventWithType(WebInputEvent::GestureDoubleTap)));
+  EXPECT_EQ(1, client_->in_flight_event_count());
+  SendInputEventACK(WebInputEvent::GestureTap, INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(0, client_->in_flight_event_count());
 }
 
 // Test that the router will call the client's |DidFlush| after all events have
 // been dispatched following a call to |Flush|.
 TEST_F(InputRouterImplTest, InputFlush) {
   EXPECT_FALSE(HasPendingEvents());
 
   // Flushing an empty router should immediately trigger DidFlush.
   Flush();
@@ skipping 109 matching lines @@
 
   // Ack the second scroll.
   SendInputEventACK(WebInputEvent::GestureScrollUpdate,
                     INPUT_EVENT_ACK_STATE_CONSUMED);
   EXPECT_EQ(0U, GetSentMessageCountAndResetSink());
   EXPECT_EQ(1U, ack_handler_->GetAndResetAckCount());
   EXPECT_EQ(0, client_->in_flight_event_count());
 }
 
 }  // namespace content