[Android] More eager gesture recognition hardening

content/browser/renderer_host/input/gesture_event_packet.cc

Index: content/browser/renderer_host/input/gesture_event_packet.cc
diff --git a/content/browser/renderer_host/input/gesture_event_packet.cc b/content/browser/renderer_host/input/gesture_event_packet.cc
index 10b12e923f568cc35329e9606d979db263b4b64e..542e719f4d0bfdcb21a819e28e90da73a2d9c52f 100644
--- a/content/browser/renderer_host/input/gesture_event_packet.cc
+++ b/content/browser/renderer_host/input/gesture_event_packet.cc
@@ -52,9 +52,24 @@ GestureEventPacket::GestureEventPacket(GestureSource 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;
 }