Enable pinch-zoom telemetry on Mac

content/browser/renderer_host/input/synthetic_gesture_target_mac.h

+// Copyright 2015 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.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_MAC_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_MAC_H_
+
+#include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
+#include "content/browser/renderer_host/render_widget_host_view_mac.h"
+#include "content/common/input/synthetic_gesture_params.h"
+
+namespace content {
+
+// SyntheticGestureTarget implementation for mac
+class SyntheticGestureTargetMac : public SyntheticGestureTargetBase {
+ public:
+  explicit SyntheticGestureTargetMac(RenderWidgetHostImpl* host,

[jdduke (slow), 2015/09/22 21:58:49]

Nit: Not sure we need "explicit" for multi-arg constructors?

[ericrk, 2015/09/22 22:08:49]

we don't - wish there was a lint check for this one, guess I should write a CL
:D

+                                     RenderWidgetHostViewCocoa* cocoa_view);
+
+  // SyntheticGestureTarget:
+  void DispatchInputEventToPlatform(const blink::WebInputEvent& event) override;
+
+ private:
+  RenderWidgetHostViewCocoa* cocoa_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyntheticGestureTargetMac);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_SYNTHETIC_GESTURE_TARGET_MAC_H_