Adding Chrome-side WebVR interface

content/renderer/vr/vr_dispatcher.cc

+// 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.
+
+#include "content/renderer/vr/vr_dispatcher.h"
+
+#include "content/public/common/service_registry.h"
+#include "content/renderer/vr/vr_type_converters.h"
+
+namespace content {
+
+VRDispatcher::VRDispatcher(ServiceRegistry* service_registry)
+    : service_registry_(service_registry) {
+}
+
+VRDispatcher::~VRDispatcher() {
+}
+
+VRServicePtr& VRDispatcher::GetVRServicePtr() {
+  if (!vr_service_.get()) {

[Ken Rockot(use gerrit already), 2015/05/31 23:43:47]

nit: vr_service_ is testable, no need to get()

+    service_registry_->ConnectToRemoteService(mojo::GetProxy(&vr_service_));
+  }
+  return vr_service_;
+}
+
+void VRDispatcher::getDevices(blink::WebVRGetDevicesCallback* callback) {
+  int request_id = pending_requests_.Add(callback);
+  GetVRServicePtr()->GetDevices(
+      base::Bind(&VRDispatcher::OnGetDevices,
+                 base::Unretained(this),
+                 request_id));
+}
+
+void VRDispatcher::getSensorState(unsigned int index,
+                                  blink::WebHMDSensorState& state) {
+  GetVRServicePtr()->GetSensorState(index,
+      base::Bind(&VRDispatcher::OnGetSensorState,

[Ken Rockot(use gerrit already), 2015/05/31 23:43:47]

nit: OnGetSensorState doesn't actually need |this| and could just be static or
defined in an anonymous namespace

+                 base::Unretained(this),
+                 base::Unretained(&state)));
+
+  // TODO: Justify this.

[Ken Rockot(use gerrit already), 2015/05/31 23:43:47]

What do you mean? Justify the call to WaitForIncomingResponse (which is easy to
justify if the API must be synchronous), or justify that the API is synchronous?
:)

+  GetVRServicePtr().WaitForIncomingResponse();
+}
+
+void VRDispatcher::resetSensor(unsigned int index) {
+  GetVRServicePtr()->ResetSensor(index);
+}
+
+void VRDispatcher::OnGetDevices(
+    int request_id,
+    const mojo::Array<VRDeviceInfoPtr>& devices) {
+  blink::WebVector<blink::WebVRDevice> web_devices(devices.size());
+
+  blink::WebVRGetDevicesCallback* callback =
+      pending_requests_.Lookup(request_id);
+  if (!callback)
+    return;
+
+  for (size_t i = 0; i < devices.size(); ++i) {
+    const VRDeviceInfoPtr& mojo_device = devices[i];

[Ken Rockot(use gerrit already), 2015/05/31 23:43:47]

nit: maybe just do devices[i].To<blink::WebVRDevice()?

+    web_devices[i] = mojo_device.To<blink::WebVRDevice>();
+  }
+
+  callback->onSuccess(&web_devices);
+  pending_requests_.Remove(request_id);
+}
+
+void VRDispatcher::OnGetSensorState(
+    blink::WebHMDSensorState* state,
+    const VRSensorStatePtr& mojo_state) {
+  *state = mojo_state.To<blink::WebHMDSensorState>();
+}
+
+}  // namespace content