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

content/browser/renderer_host/input/synthetic_mouse_driver.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/input/synthetic_mouse_driver.h"
 
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 
 namespace content {
 
 SyntheticMouseDriver::SyntheticMouseDriver() {}
 
 SyntheticMouseDriver::~SyntheticMouseDriver() {}
 
 void SyntheticMouseDriver::DispatchEvent(SyntheticGestureTarget* target,
                                          const base::TimeTicks& timestamp) {
-  mouse_event_.timeStampSeconds = ConvertTimestampToSeconds(timestamp);
+  mouse_event_.setTimeStampSeconds(ConvertTimestampToSeconds(timestamp));
   target->DispatchInputEventToPlatform(mouse_event_);
 }
 
 int SyntheticMouseDriver::Press(float x, float y) {
   mouse_event_ = SyntheticWebMouseEventBuilder::Build(
       blink::WebInputEvent::MouseDown, x, y, 0);
   mouse_event_.clickCount = 1;
   return 0;
 }
 
@@ skipping 33 matching lines @@
   if (params.pointer_action_type() ==
           SyntheticPointerActionParams::PointerActionType::RELEASE &&
       mouse_event_.clickCount <= 0) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace content