Enable pinch-zoom telemetry on Mac

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 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/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 
@@ skipping 23 matching lines @@
 #include "content/browser/compositor/resize_lock.h"
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/gpu/compositor_util.h"
 #include "content/browser/renderer_host/input/web_input_event_builders_mac.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_helper.h"
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
 #include "content/browser/renderer_host/render_widget_host_input_event_router.h"
+#import "content/browser/renderer_host/input/synthetic_gesture_target_mac.h"
 #import "content/browser/renderer_host/render_widget_host_view_mac_dictionary_helper.h"
 #import "content/browser/renderer_host/render_widget_host_view_mac_editcommand_helper.h"
 #include "content/browser/renderer_host/render_widget_resize_helper_mac.h"
 #import "content/browser/renderer_host/text_input_client_mac.h"
 #include "content/common/accessibility_messages.h"
 #include "content/common/edit_command.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/input_messages.h"
 #include "content/common/view_messages.h"
 #include "content/common/webplugin_geometry.h"
@@ skipping 1576 matching lines @@
 void RenderWidgetHostViewMac::WheelEventAck(
     const blink::WebMouseWheelEvent& event,
     InputEventAckState ack_result) {
   bool consumed = ack_result == INPUT_EVENT_ACK_STATE_CONSUMED;
   // Only record a wheel event as unhandled if JavaScript handlers got a chance
   // to see it (no-op wheel events are ignored by the event dispatcher)
   if (event.deltaX || event.deltaY)
     [cocoa_view_ processedWheelEvent:event consumed:consumed];
 }
 
+scoped_ptr<SyntheticGestureTarget>
+RenderWidgetHostViewMac::CreateSyntheticGestureTarget() {
+  RenderWidgetHostImpl* host =
+      RenderWidgetHostImpl::From(GetRenderWidgetHost());
+  return scoped_ptr<SyntheticGestureTarget>(
+      new SyntheticGestureTargetMac(host, cocoa_view_));
+}
+
 uint32_t RenderWidgetHostViewMac::GetSurfaceIdNamespace() {
   if (delegated_frame_host_)
     return delegated_frame_host_->GetSurfaceIdNamespace();
 
   return 0;
 }
 
 uint32_t RenderWidgetHostViewMac::SurfaceIdNamespaceAtPoint(
     const gfx::Point& point,
     gfx::Point* transformed_point) {
@@ skipping 1757 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end