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

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

 /*
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 83 matching lines @@
 
   void registerMockedHttpURLLoad(const std::string& fileName) {
     URLTestHelpers::registerMockedURLFromBaseURL(
         WebString::fromUTF8(m_baseURL.c_str()),
         WebString::fromUTF8(fileName.c_str()));
   }
 
   WebGestureEvent generateEvent(WebInputEvent::Type type,
                                 int deltaX = 0,
                                 int deltaY = 0) {
-    WebGestureEvent event;
-    event.type = type;
+    WebGestureEvent event(type, WebInputEvent::NoModifiers,
+                          WebInputEvent::TimeStampForTesting);
     event.sourceDevice = WebGestureDeviceTouchscreen;
     event.x = 100;
     event.y = 100;
     if (type == WebInputEvent::GestureScrollUpdate) {
       event.data.scrollUpdate.deltaX = deltaX;
       event.data.scrollUpdate.deltaY = deltaY;
     }
     return event;
   }
 
@@ skipping 803 matching lines @@
     view->setScrollOffset(view->getScrollOffset(), ProgrammaticScroll);
 
     ASSERT_EQ(80.f, webView->browserControls().contentOffset());
     EXPECT_EQ(expectedRootOffset, rootViewport->getScrollOffset().height());
 
     webView->handleInputEvent(generateEvent(WebInputEvent::GestureScrollEnd));
   }
 }
 
 }  // namespace blink