Synthesize ctrl-wheel events on touchpad pinch

content/browser/renderer_host/input/gesture_event_queue_unittest.cc

 // Copyright 2014 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 <vector>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 77 matching lines @@
 
   void SimulateGestureScrollUpdateEvent(float dX, float dY, int modifiers) {
     SimulateGestureEvent(
         SyntheticWebGestureEventBuilder::BuildScrollUpdate(dX, dY, modifiers));
   }
 
   void SimulateGesturePinchUpdateEvent(float scale,
                                        float anchorX,
                                        float anchorY,
                                        int modifiers) {
-    SimulateGestureEvent(
-        SyntheticWebGestureEventBuilder::BuildPinchUpdate(scale,
-                                                          anchorX,
-                                                          anchorY,
-                                                          modifiers));
+    SimulateGestureEvent(SyntheticWebGestureEventBuilder::BuildPinchUpdate(
+        scale, anchorX, anchorY, modifiers, WebGestureEvent::Touchscreen));
   }
 
   void SimulateGestureFlingStartEvent(
       float velocityX,
       float velocityY,
       WebGestureEvent::SourceDevice sourceDevice) {
     SimulateGestureEvent(
         SyntheticWebGestureEventBuilder::BuildFling(velocityX,
                                                     velocityY,
                                                     sourceDevice));
@@ skipping 1077 matching lines @@
   gesture_event.data.flingStart.velocityX = 0.f;
   gesture_event.data.flingStart.velocityY = 0.f;
   ASSERT_EQ(0U, GetAndResetSentGestureEventCount());
   ASSERT_EQ(0U, GestureEventQueueSize());
   EXPECT_FALSE(SimulateGestureEvent(gesture_event));
   EXPECT_EQ(0U, GetAndResetSentGestureEventCount());
   EXPECT_EQ(0U, GestureEventQueueSize());
 }
 
 }  // namespace content