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

chrome/browser/policy/policy_browsertest.cc

Index: chrome/browser/policy/policy_browsertest.cc
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index 3de03b3b091e4cac394350ce76e5847ec7577b7b..72e387741f4d6ea3ccaaa7df5744a03835ab9356 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -784,14 +784,15 @@ class PolicyTest : public InProcessBrowserTest {
   void PerformClick(int x, int y) {
     content::WebContents* contents =
         browser()->tab_strip_model()->GetActiveWebContents();
-    blink::WebMouseEvent click_event;
-    click_event.type = blink::WebInputEvent::MouseDown;
+    blink::WebMouseEvent click_event(blink::WebInputEvent::MouseDown,
+                                     blink::WebInputEvent::NoModifiers,
+                                     blink::WebInputEvent::TimeStampForTesting);
     click_event.button = blink::WebMouseEvent::Button::Left;
     click_event.clickCount = 1;
     click_event.x = x;
     click_event.y = y;
     contents->GetRenderViewHost()->GetWidget()->ForwardMouseEvent(click_event);
-    click_event.type = blink::WebInputEvent::MouseUp;
+    click_event.setType(blink::WebInputEvent::MouseUp);
     contents->GetRenderViewHost()->GetWidget()->ForwardMouseEvent(click_event);
   }