Handle mac trackpad zoom via GesturePinch events

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 947 matching lines @@
   EXPECT_EQ(1U, ack_handler_->GetAndResetAckCount());
 
 
   // GesturePinchBegin ignores its ack.
   SimulateGestureEvent(WebInputEvent::GesturePinchBegin,
                        WebGestureEvent::Touchscreen);
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
   EXPECT_EQ(1U, ack_handler_->GetAndResetAckCount());
 
   // GesturePinchUpdate waits for an ack.
+  // This also verifies that GesturePinchUpdates for touchscreen are sent
+  // to the renderer (in contrast to the TrackpadPinchUpdate test).
   SimulateGestureEvent(WebInputEvent::GesturePinchUpdate,
                        WebGestureEvent::Touchscreen);
   EXPECT_EQ(1U, GetSentMessageCountAndResetSink());
   EXPECT_EQ(0U, ack_handler_->GetAndResetAckCount());
 
   SimulateGestureEvent(WebInputEvent::GestureShowPress,
                        WebGestureEvent::Touchscreen);
   EXPECT_EQ(0U, GetSentMessageCountAndResetSink());
   // The ShowPress, though it ignores ack, is still stuck in the queue
   // behind the PinchUpdate which requires an ack.
@@ skipping 312 matching lines @@
   // 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(
       WebInputEvent::GestureDoubleTap));
   EXPECT_EQ(0, client_->in_flight_event_count());
 }
 
+// Test that GesturePinchUpdate is handled specially for trackpad
+TEST_F(InputRouterImplTest, TrackpadPinchUpdate) {
+  // For now Trackpad PinchUpdate events are just immediately ACKed
+  // as unconsumed without going to the renderer.
+  // TODO(rbyers): Update for wheel event behavior - crbug.com/289887.
+  // Note that the Touchscreen case is verified as NOT doing this as
+  // part of the ShowPressIsInOrder test.
+  SimulateGestureEvent(WebInputEvent::GesturePinchUpdate,
+                       WebGestureEvent::Touchpad);
+  ASSERT_EQ(0U, GetSentMessageCountAndResetSink());
+  EXPECT_EQ(1U, ack_handler_->GetAndResetAckCount());
+  EXPECT_EQ(INPUT_EVENT_ACK_STATE_NOT_CONSUMED, ack_handler_->ack_state());
+  EXPECT_EQ(0, client_->in_flight_event_count());
+}
+
 }  // namespace content