Events ignoring ack disposition receive synthetic acks.

content/browser/renderer_host/input/immediate_input_router_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/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/renderer_host/input/gesture_event_filter.h"
 #include "content/browser/renderer_host/input/immediate_input_router.h"
 #include "content/browser/renderer_host/input/input_router_client.h"
@@ skipping 540 matching lines @@
 
   // Check that the second event was sent.
   EXPECT_TRUE(process_->sink().GetUniqueMessageMatching(
                   InputMsg_HandleInputEvent::ID));
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
 
   // Check that the correct unhandled wheel event was received.
   EXPECT_EQ(ack_handler_->acked_wheel_event().deltaY, -5);
 }
 
+// Test that events ignoring ack disposition don't wait for ACKs.
+TEST_F(ImmediateInputRouterTest, EventsIgnoringAckDispositionDontWaitForAcks) {
+  SimulateGestureEvent(WebInputEvent::GestureShowPress,
+                       WebGestureEvent::Touchscreen);
+
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());

[jdduke (slow), 2013/10/25 20:37:12]

Please also check that 1) We get the ack immediately (GetAndResetAckCount()),
and 2) Sending the ack later has no effect.

[tdresser, 2013/11/04 15:57:30]

Done.

+
+  SimulateGestureEvent(WebInputEvent::GestureShowPress,
+                       WebGestureEvent::Touchscreen);
+
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+
+  SimulateGestureEvent(WebInputEvent::GestureShowPress,
+                       WebGestureEvent::Touchscreen);
+
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+}
+
+// Test that events don't get out of order due to ignoring their acks.
+TEST_F(ImmediateInputRouterTest, EventsIgnoringAckDispositionStayInOrder) {
+  SimulateGestureEvent(WebInputEvent::GestureFlingStart,
+                       WebGestureEvent::Touchscreen);
+
+  EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
+
+  SimulateGestureEvent(WebInputEvent::GestureShowPress,
+                       WebGestureEvent::Touchscreen);
+
+  EXPECT_EQ(0U, GetSentMessageCountAndResetSink());
+
+  SimulateGestureEvent(WebInputEvent::GestureShowPress,
+                       WebGestureEvent::Touchscreen);
+
+  EXPECT_EQ(0U, GetSentMessageCountAndResetSink());
+
+  SendInputEventACK(WebInputEvent::GestureFlingStart,
+                    INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
+
+  EXPECT_EQ(2U, GetSentMessageCountAndResetSink());

[jdduke (slow), 2013/10/25 20:37:12]

Same as above, check that we get the immediate ack and that a later ack from the
renderer has no effect.

[tdresser, 2013/11/04 15:57:30]

Done.

+}
+
 }  // namespace content