[Android] More eager gesture recognition hardening

content/browser/renderer_host/input/gesture_event_packet.cc

 // Copyright 2014 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/gesture_event_packet.h"
 
 #include "base/logging.h"
 
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
@@ skipping 34 matching lines @@
 GestureEventPacket::GestureEventPacket()
     : gesture_count_(0),
       gesture_source_(UNDEFINED) {}
 
 GestureEventPacket::GestureEventPacket(GestureSource source)
     : gesture_count_(0),
       gesture_source_(source) {
   DCHECK_NE(gesture_source_, UNDEFINED);
 }
 
+GestureEventPacket::GestureEventPacket(const GestureEventPacket& other)
+    : gesture_count_(other.gesture_count_),
+      gesture_source_(other.gesture_source_) {
+  std::copy(other.gestures_, other.gestures_ + other.gesture_count_, gestures_);
+}
+
 GestureEventPacket::~GestureEventPacket() {}
 
+GestureEventPacket& GestureEventPacket::operator=(
+    const GestureEventPacket& other) {
+  gesture_count_ = other.gesture_count_;
+  gesture_source_ = other.gesture_source_;
+  std::copy(other.gestures_, other.gestures_ + other.gesture_count_, gestures_);
+  return *this;
+}
+
 void GestureEventPacket::Push(const blink::WebGestureEvent& gesture) {
+  DCHECK(WebInputEvent::isGestureEventType(gesture.type));
   CHECK_LT(gesture_count_, static_cast<size_t>(kMaxGesturesPerTouch));
   gestures_[gesture_count_++] = gesture;
 }
 
 GestureEventPacket GestureEventPacket::FromTouch(const WebTouchEvent& event) {
   return GestureEventPacket(ToGestureSource(event));
 }
 
 GestureEventPacket GestureEventPacket::FromTouchTimeout(
     const WebGestureEvent& event) {
   GestureEventPacket packet(TOUCH_TIMEOUT);
   packet.Push(event);
   return packet;
 }
 
 }  // namespace content