Add SyntheticPointerActionParams used in Chromedriver extension

content/common/input/synthetic_pointer_action_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_params.h"
+
+namespace content {
+
+SyntheticPointerActionParams::SyntheticPointerActionParams() {}

[tdresser, 2016/03/17 18:25:29]

We should make sure to give the members of this class sane default here.

+
+SyntheticPointerActionParams::SyntheticPointerActionParams(
+    PointerActionType type) {
+  pointer_action_type_arg = type;

[tdresser, 2016/03/17 18:25:29]

And here.

+}
+
+SyntheticPointerActionParams::SyntheticPointerActionParams(
+    const SyntheticPointerActionParams& other)
+    : SyntheticGestureParams(other) {
+  pointer_action_type_arg = other.pointer_action_type();
+  if (other.pointer_action_type() !=

[tdresser, 2016/03/17 18:25:29]

This might be clearer as a switch statement.

[lanwei, 2016/03/22 00:33:43]

Done.

+      SyntheticGestureParams::PointerActionType::PROCESS)
+    index_arg = other.index();
+  if (other.pointer_action_type() ==
+          SyntheticGestureParams::PointerActionType::PRESS ||
+      other.pointer_action_type() ==
+          SyntheticGestureParams::PointerActionType::MOVE)
+    position_arg = other.position();
+}
+
+SyntheticPointerActionParams::~SyntheticPointerActionParams() {}
+
+SyntheticGestureParams::GestureType
+SyntheticPointerActionParams::GetGestureType() const {
+  return POINTER_ACTION;
+}
+
+const SyntheticPointerActionParams* SyntheticPointerActionParams::Cast(
+    const SyntheticGestureParams* gesture_params) {
+  DCHECK(gesture_params);
+  DCHECK_EQ(POINTER_ACTION, gesture_params->GetGestureType());
+  return static_cast<const SyntheticPointerActionParams*>(gesture_params);
+}
+
+}  // namespace content