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

third_party/WebKit/public/platform/WebMouseWheelEvent.h

Index: third_party/WebKit/public/platform/WebMouseWheelEvent.h
diff --git a/third_party/WebKit/public/platform/WebMouseWheelEvent.h b/third_party/WebKit/public/platform/WebMouseWheelEvent.h
index da654f7d62207b0e9dbbd62ae2e2cd9f5f7017e5..a252e638e108687f27070bf3d33bead94c75b0bc 100644
--- a/third_party/WebKit/public/platform/WebMouseWheelEvent.h
+++ b/third_party/WebKit/public/platform/WebMouseWheelEvent.h
@@ -53,8 +53,11 @@ class WebMouseWheelEvent : public WebMouseEvent {
   // listeners were passive or was forced to be non-blocking.
   DispatchType dispatchType;
 
-  WebMouseWheelEvent()
-      : WebMouseEvent(sizeof(WebMouseWheelEvent)),
+  WebMouseWheelEvent(Type type, int modifiers, double timeStampSeconds)
+      : WebMouseEvent(sizeof(WebMouseWheelEvent),
+                      type,
+                      modifiers,
+                      timeStampSeconds),
         deltaX(0.0f),
         deltaY(0.0f),
         wheelTicksX(0.0f),
@@ -68,6 +71,20 @@ class WebMouseWheelEvent : public WebMouseEvent {
         hasPreciseScrollingDeltas(false),
         railsMode(RailsModeFree),
         dispatchType(Blocking) {}
+
+  WebMouseWheelEvent()
+      : WebMouseEvent(sizeof(WebMouseWheelEvent)),
+        deltaX(0.0f),
+        deltaY(0.0f),
+        wheelTicksX(0.0f),
+        wheelTicksY(0.0f),
+        accelerationRatioX(1.0f),
+        accelerationRatioY(1.0f),
+        resendingPluginId(-1),
+        phase(PhaseNone),
+        momentumPhase(PhaseNone),
+        railsMode(RailsModeFree),
+        dispatchType(Blocking) {}
 };
 #pragma pack(pop)