Coalesce async touch move events until the ack back from render

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 <math.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 943 matching lines @@
                   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_F(InputRouterImplTest, TouchTypesIgnoringAck) {
   OnHasTouchEventHandlers(true);
   // Only acks for TouchCancel should always be ignored.
-  ASSERT_FALSE(WebInputEventTraits::IgnoresAckDisposition(
+  ASSERT_TRUE(WebInputEventTraits::WillReceiveAckFromRenderer(
       GetEventWithType(WebInputEvent::TouchStart)));
-  ASSERT_FALSE(WebInputEventTraits::IgnoresAckDisposition(
+  ASSERT_TRUE(WebInputEventTraits::WillReceiveAckFromRenderer(
       GetEventWithType(WebInputEvent::TouchMove)));
-  ASSERT_FALSE(WebInputEventTraits::IgnoresAckDisposition(
+  ASSERT_TRUE(WebInputEventTraits::WillReceiveAckFromRenderer(
       GetEventWithType(WebInputEvent::TouchEnd)));
 
   // Precede the TouchCancel with an appropriate TouchStart;
   PressTouchPoint(1, 1);
   SendTouchEvent();
   SendInputEventACK(WebInputEvent::TouchStart, INPUT_EVENT_ACK_STATE_CONSUMED);
   ASSERT_EQ(1U, GetSentMessageCountAndResetSink());
   ASSERT_EQ(1U, ack_handler_->GetAndResetAckCount());
   ASSERT_EQ(0, client_->in_flight_event_count());
 
@@ skipping 38 matching lines @@
       WebInputEvent::GestureTapCancel,
       WebInputEvent::GestureScrollBegin,
       WebInputEvent::GestureScrollUpdate,
       WebInputEvent::GesturePinchBegin,
       WebInputEvent::GesturePinchUpdate,
       WebInputEvent::GesturePinchEnd,
       WebInputEvent::GestureScrollEnd};
   for (size_t i = 0; i < arraysize(eventTypes); ++i) {
     WebInputEvent::Type type = eventTypes[i];
     SCOPED_TRACE(WebInputEventTraits::GetName(type));
-    if (!WebInputEventTraits::IgnoresAckDisposition(GetEventWithType(type))) {
+    if (WebInputEventTraits::WillReceiveAckFromRenderer(
+            GetEventWithType(type))) {
       SimulateGestureEvent(type, blink::WebGestureDeviceTouchscreen);
       EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
       EXPECT_EQ(0U, ack_handler_->GetAndResetAckCount());
       EXPECT_EQ(1, client_->in_flight_event_count());
       EXPECT_TRUE(HasPendingEvents());
 
       SendInputEventACK(type, INPUT_EVENT_ACK_STATE_CONSUMED);
       EXPECT_EQ(0U, GetSentMessageCountAndResetSink());
       EXPECT_EQ(1U, ack_handler_->GetAndResetAckCount());
       EXPECT_EQ(0, client_->in_flight_event_count());
@@ skipping 18 matching lines @@
   }
 }
 
 TEST_F(InputRouterImplTest, MouseTypesIgnoringAck) {
   int start_type = static_cast<int>(WebInputEvent::MouseDown);
   int end_type = static_cast<int>(WebInputEvent::ContextMenu);
   ASSERT_LT(start_type, end_type);
   for (int i = start_type; i <= end_type; ++i) {
     WebInputEvent::Type type = static_cast<WebInputEvent::Type>(i);
     int expected_in_flight_event_count =
-        WebInputEventTraits::IgnoresAckDisposition(GetEventWithType(type)) ? 0
-                                                                           : 1;
+        !WebInputEventTraits::WillReceiveAckFromRenderer(GetEventWithType(type))
+            ? 0
+            : 1;
 
     // Note: Mouse event acks are never forwarded to the ack handler, so the key
     // result here is that ignored ack types don't affect the in-flight count.
     SimulateMouseEvent(type, 0, 0);
     EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
     EXPECT_EQ(0U, ack_handler_->GetAndResetAckCount());
     EXPECT_EQ(expected_in_flight_event_count, client_->in_flight_event_count());
     if (expected_in_flight_event_count) {
       SendInputEventACK(type, INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
       EXPECT_EQ(0U, GetSentMessageCountAndResetSink());
       EXPECT_EQ(0U, ack_handler_->GetAndResetAckCount());
       EXPECT_EQ(0, client_->in_flight_event_count());
     }
   }
 }
 
 // Guard against breaking changes to the list of ignored event ack types in
-// |WebInputEventTraits::IgnoresAckDisposition|.
+// |WebInputEventTraits::WillReceiveAckFromRenderer|.
 TEST_F(InputRouterImplTest, RequiredEventAckTypes) {
   const WebInputEvent::Type kRequiredEventAckTypes[] = {
     WebInputEvent::MouseMove,
     WebInputEvent::MouseWheel,
     WebInputEvent::RawKeyDown,
     WebInputEvent::KeyDown,
     WebInputEvent::KeyUp,
     WebInputEvent::Char,
     WebInputEvent::GestureScrollUpdate,
     WebInputEvent::GestureFlingStart,
     WebInputEvent::GestureFlingCancel,
     WebInputEvent::GesturePinchUpdate,
     WebInputEvent::TouchStart,
     WebInputEvent::TouchMove
   };
   for (size_t i = 0; i < arraysize(kRequiredEventAckTypes); ++i) {
     const WebInputEvent::Type required_ack_type = kRequiredEventAckTypes[i];
-    EXPECT_FALSE(WebInputEventTraits::IgnoresAckDisposition(
+    ASSERT_TRUE(WebInputEventTraits::WillReceiveAckFromRenderer(
         GetEventWithType(required_ack_type)));
   }
 }
 
 // Test that GestureShowPress, GestureTapDown and GestureTapCancel events don't
 // wait for ACKs.
 TEST_F(InputRouterImplTest, GestureTypesIgnoringAckInterleaved) {
   // Interleave a few events that do and do not ignore acks, ensuring that
   // ack-ignoring events aren't dispatched until all prior events which observe
   // their ack disposition have been dispatched.
@@ skipping 397 matching lines @@
   SimulateGestureEvent(WebInputEvent::GestureTapDown,
                        blink::WebGestureDeviceTouchscreen);
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
 
   // The GestureTapUnconfirmed is converted into a tap, as the touch action is
   // none.
   SimulateGestureEvent(WebInputEvent::GestureTapUnconfirmed,
                        blink::WebGestureDeviceTouchscreen);
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
   // This test will become invalid if GestureTap stops requiring an ack.
-  ASSERT_FALSE(WebInputEventTraits::IgnoresAckDisposition(
+  ASSERT_TRUE(WebInputEventTraits::WillReceiveAckFromRenderer(
       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,
                        blink::WebGestureDeviceTouchscreen);
   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,
                        blink::WebGestureDeviceTouchscreen);
   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,
                        blink::WebGestureDeviceTouchscreen);
   // This test will become invalid if GestureDoubleTap stops requiring an ack.
-  ASSERT_FALSE(WebInputEventTraits::IgnoresAckDisposition(
+  ASSERT_TRUE(WebInputEventTraits::WillReceiveAckFromRenderer(
       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());
@@ skipping 234 matching lines @@
   client_overscroll = client_->GetAndResetOverscroll();
   EXPECT_EQ(wheel_overscroll.accumulated_overscroll,
             client_overscroll.accumulated_overscroll);
   EXPECT_EQ(wheel_overscroll.latest_overscroll_delta,
             client_overscroll.latest_overscroll_delta);
   EXPECT_EQ(wheel_overscroll.current_fling_velocity,
             client_overscroll.current_fling_velocity);
 }
 
 }  // namespace content