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()
+    : pointer_action_type_(PointerActionType::NOT_INITIALIZED), index_(-1) {}
+
+SyntheticPointerActionParams::SyntheticPointerActionParams(
+    PointerActionType type)
+    : pointer_action_type_(type), index_(-1) {}
+
+SyntheticPointerActionParams::SyntheticPointerActionParams(
+    const SyntheticPointerActionParams& other)
+    : SyntheticGestureParams(other),
+      pointer_action_type_(other.pointer_action_type()) {
+  switch (other.pointer_action_type()) {
+    case PointerActionType::PRESS:
+    case PointerActionType::MOVE:
+      position_ = other.position();

[tdresser, 2016/03/23 15:09:25]

We generally avoid case statement fallthrough (except for empty cases).

Add the index_ assignment to this clause as well, and add a break.

[lanwei, 2016/03/30 21:02:53]

Done.

+    case PointerActionType::RELEASE:
+      index_ = other.index();
+      break;
+    default:
+      break;
+  }
+}
+
+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