Make SyntheticPointerAction to flush the pointer action sequence

content/common/input/synthetic_pointer_action_list_params.cc

+// Copyright 2016 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/common/input/synthetic_pointer_action_list_params.h"
+
+namespace content {
+
+SyntheticPointerActionListParams::SyntheticPointerActionListParams() {}
+
+SyntheticPointerActionListParams::SyntheticPointerActionListParams(
+    SyntheticPointerActionParams param) {
+  param_list.push_back(param);
+}
+
+SyntheticPointerActionListParams::SyntheticPointerActionListParams(
+    const SyntheticPointerActionListParams& other)

[Navid Zolghadr, 2016/11/01 19:08:42]

Don't we need to call the cctor of the parent class here to copy
gesture_source_type as well? I believe by default it just calls the default
constructor of parent. Also now that the copy constructor is implemented should
we also implement the = operator (and maybe move constructors)?
https://en.wikipedia.org/wiki/Rule_of_three_(C%2B%2B_programming)
I can see it is not the case but I was just wondering if that was just missing
that or was it intentional.

On the other hand, do we even need the copy constructor here? It doesn't seem
you have done anything particular here.

[lanwei, 2016/12/04 18:08:02]

Acknowledged.

We have to keep this copy constructor here, in CreateGesture,
https://cs.chromium.org/chromium/src/content/browser/renderer_host/input/synt...
it calls all its subclasses' copy constructors.

+    : param_list(other.param_list) {}
+
+SyntheticPointerActionListParams::~SyntheticPointerActionListParams() {}
+
+SyntheticGestureParams::GestureType
+SyntheticPointerActionListParams::GetGestureType() const {
+  return POINTER_ACTION_LIST;
+}
+
+const SyntheticPointerActionListParams* SyntheticPointerActionListParams::Cast(
+    const SyntheticGestureParams* gesture_params) {
+  DCHECK(gesture_params);
+  DCHECK_EQ(POINTER_ACTION_LIST, gesture_params->GetGestureType());
+  return static_cast<const SyntheticPointerActionListParams*>(gesture_params);
+}
+
+}  // namespace content