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"
+
+#include "base/logging.h"
+
+namespace content {
+
+// Set the default tap duration to 50ms to lie within the bounds of the Aura
+// gesture recognizer for identifying clicks (currently 0.01s-0.80s).

[tdresser, 2016/02/29 15:06:56]

Is isn't clear what code this comment is referring to.

[lanwei, 2016/03/07 05:41:58]

Done.

+SyntheticPointerActionParams::SyntheticPointerActionParams() {}
+
+SyntheticPointerActionParams::SyntheticPointerActionParams(
+    const SyntheticPointerActionParams& other)
+    : SyntheticGestureParams(other),
+      index(other.index),
+      position(other.position),
+      pointer_action_type(other.pointer_action_type),
+      process(other.process) {}
+
+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