MacViews: Send Mac scrollWheel NSEvents as ui::ET_SCROLL (ui::ScrollEvent).

ui/events/test/cocoa_test_event_utils.h

 // 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.
 
 #ifndef UI_EVENTS_TEST_COCOA_TEST_EVENT_UTILS_H_
 #define UI_EVENTS_TEST_COCOA_TEST_EVENT_UTILS_H_
 
 #import <Cocoa/Cocoa.h>
 #import <objc/objc-class.h>
 
@@ skipping 32 matching lines @@
 // Return a mouse down and an up event with the given |clickCount| at
 // |view|'s midpoint.
 std::pair<NSEvent*, NSEvent*> MouseClickInView(NSView* view,
                                                NSUInteger clickCount);
 
 // Return a right mouse down and an up event with the given |clickCount| at
 // |view|'s midpoint.
 std::pair<NSEvent*, NSEvent*> RightMouseClickInView(NSView* view,
                                                     NSUInteger clickCount);
 
-// Creates a test scroll event. Currently only events for a "real" mouse wheel
-// are supported (-hasPreciseScrollingDeltas is NO).  If |window| is nil,
-// |location| is assumed to be AppKit screen coordinates (origin in bottom left
-// of primary screen).
-// TODO(tapted): Add event phase arguments to support trackpad scrolls also.
+// Creates a test scroll event. |has_precise_deltas| determines the value of
+// -[NSEvent hasPreciseScrollingDeltas] - usually NO for a mouse wheel and YES
+// for a trackpad. If |window| is nil, |location| is assumed to be AppKit screen
+// coordinates (origin in bottom left of primary screen).
 NSEvent* TestScrollEvent(NSPoint location,
                          NSWindow* window,
                          CGFloat delta_x,
-                         CGFloat delta_y);
+                         CGFloat delta_y,
+                         bool has_precise_deltas,
+                         NSEventPhase event_phase,
+                         NSEventPhase momentum_phase);
 
 // Returns a key event with the given character.
 NSEvent* KeyEventWithCharacter(unichar c);
 
 // Returns a key event with the given type and modifier flags.
 NSEvent* KeyEventWithType(NSEventType event_type, NSUInteger modifiers);
 
 // Returns a key event with the given key code, type, and modifier flags.
 NSEvent* KeyEventWithKeyCode(unsigned short key_code,
                              unichar c,
@@ skipping 15 matching lines @@
 // Creates a key event in a particular window.
 NSEvent* SynthesizeKeyEvent(NSWindow* window,
                             bool keyDown,
                             ui::KeyboardCode keycode,
                             NSUInteger flags,
                             ui::DomKey dom_key = ui::DomKey::NONE);
 
 }  // namespace cocoa_test_event_utils
 
 #endif  // UI_EVENTS_TEST_COCOA_TEST_EVENT_UTILS_H_