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

components/printing/test/print_web_view_helper_browsertest.cc

Index: components/printing/test/print_web_view_helper_browsertest.cc
diff --git a/components/printing/test/print_web_view_helper_browsertest.cc b/components/printing/test/print_web_view_helper_browsertest.cc
index 6609fbc59fffe91b322581fb4665a40c7c5fcbf7..213bc875056e475e159444b2ab5fdcbc89b04fe7 100644
--- a/components/printing/test/print_web_view_helper_browsertest.cc
+++ b/components/printing/test/print_web_view_helper_browsertest.cc
@@ -645,14 +645,15 @@ TEST_F(MAYBE_PrintWebViewHelperPreviewTest, PrintWithJavaScript) {
 
   gfx::Rect bounds = GetElementBounds("print");
   EXPECT_FALSE(bounds.IsEmpty());
-  blink::WebMouseEvent mouse_event;
-  mouse_event.type = blink::WebInputEvent::MouseDown;
+  blink::WebMouseEvent mouse_event(blink::WebInputEvent::MouseDown,
+                                   blink::WebInputEvent::NoModifiers,
+                                   blink::WebInputEvent::TimeStampForTesting);
   mouse_event.button = blink::WebMouseEvent::Button::Left;
   mouse_event.x = bounds.CenterPoint().x();
   mouse_event.y = bounds.CenterPoint().y();
   mouse_event.clickCount = 1;
   SendWebMouseEvent(mouse_event);
-  mouse_event.type = blink::WebInputEvent::MouseUp;
+  mouse_event.setType(blink::WebInputEvent::MouseUp);
   SendWebMouseEvent(mouse_event);
 
   VerifyPreviewRequest(true);