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

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

Index: third_party/WebKit/Source/web/tests/FrameTestHelpers.cpp
diff --git a/third_party/WebKit/Source/web/tests/FrameTestHelpers.cpp b/third_party/WebKit/Source/web/tests/FrameTestHelpers.cpp
index 87ceecaaab3cec12035240ce67b0c078f1d3280f..969aae0ff9b0edd5deee49d897db1f73b4fc1d81 100644
--- a/third_party/WebKit/Source/web/tests/FrameTestHelpers.cpp
+++ b/third_party/WebKit/Source/web/tests/FrameTestHelpers.cpp
@@ -158,11 +158,9 @@ WebMouseEvent createMouseEvent(WebInputEvent::Type type,
                                WebMouseEvent::Button button,
                                const IntPoint& point,
                                int modifiers) {
-  WebMouseEvent result;
-  result.type = type;
+  WebMouseEvent result(type, modifiers, WebInputEvent::TimeStampForTesting);
   result.x = result.windowX = result.globalX = point.x();
   result.y = result.windowX = result.globalX = point.y();
-  result.modifiers = modifiers;
   result.button = button;
   result.clickCount = 1;
   return result;