Add constructors to WebInputEvents and setters so we can work at cleaning up these public structs.

third_party/WebKit/Source/web/tests/RootScrollerTest.cpp

 // Copyright 2016 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 "core/dom/ClientRect.h"
 #include "core/frame/BrowserControls.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/RootFrameViewport.h"
 #include "core/frame/VisualViewport.h"
@@ skipping 131 matching lines @@
                                             int deltaX = 0,
                                             int deltaY = 0) {
     return generateGestureEvent(type, WebGestureDeviceTouchpad, deltaX, deltaY);
   }
 
  protected:
   WebGestureEvent generateGestureEvent(WebInputEvent::Type type,
                                        WebGestureDevice device,
                                        int deltaX,
                                        int deltaY) {
-    WebGestureEvent event;
-    event.type = type;
+    WebGestureEvent event(type, WebInputEvent::NoModifiers,
+                          WebInputEvent::TimeStampForTesting);
     event.sourceDevice = device;
     event.x = 100;
     event.y = 100;
     if (type == WebInputEvent::GestureScrollUpdate) {
       event.data.scrollUpdate.deltaX = deltaX;
       event.data.scrollUpdate.deltaY = deltaY;
     }
     return event;
   }
 
@@ skipping 1081 matching lines @@
   // FrameView without a layout.
   iframe->remove();
 
   EXPECT_EQ(mainFrameView()->layoutViewportScrollableArea(),
             &mainFrameView()->getRootFrameViewport()->layoutViewport());
 }
 
 }  // namespace
 
 }  // namespace blink