Initialize member variables of ui::ScrollEvent

ui/events/event.cc

 // Copyright (c) 2012 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 "ui/events/event.h"
 
 #if defined(USE_X11)
 #include <X11/extensions/XInput2.h>
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
@@ skipping 900 matching lines @@
 }
 
 std::string KeyEvent::GetCodeString() const {
   return KeycodeConverter::DomCodeToCodeString(code_);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ScrollEvent
 
 ScrollEvent::ScrollEvent(const base::NativeEvent& native_event)
-    : MouseEvent(native_event) {
+    : MouseEvent(native_event),
+      x_offset_(0.0f),
+      y_offset_(0.0f),
+      x_offset_ordinal_(0.0f),
+      y_offset_ordinal_(0.0f),
+      finger_count_(0) {
   if (type() == ET_SCROLL) {
     GetScrollOffsets(native_event,
                      &x_offset_, &y_offset_,
                      &x_offset_ordinal_, &y_offset_ordinal_,
                      &finger_count_);
   } else if (type() == ET_SCROLL_FLING_START ||
              type() == ET_SCROLL_FLING_CANCEL) {
     GetFlingData(native_event,
                  &x_offset_, &y_offset_,
                  &x_offset_ordinal_, &y_offset_ordinal_,
@@ skipping 42 matching lines @@
                    gfx::PointF(x, y),
                    time_stamp,
                    flags | EF_FROM_TOUCH),
       details_(details) {
 }
 
 GestureEvent::~GestureEvent() {
 }
 
 }  // namespace ui