Adding Chrome-side WebVR interface

content/browser/renderer_host/vr_message_filter.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/browser/renderer_host/vr_message_filter.h"
+
+#include "content/common/vr_messages.h"
+#include "third_party/WebKit/public/platform/WebVR.h"
+
+namespace content {
+
+VRMessageFilter::VRMessageFilter()
+    : BrowserMessageFilter(VRMsgStart) {
+}
+
+VRMessageFilter::~VRMessageFilter() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);

[no sievers, 2015/03/19 01:24:51]

I'm not sure this is guaranteed (although it might be, but it's not obvious).
But filters are refcounted across threads. The RenderProcessHost holds a
reference to the channel on the UI thread, the channel holds a reference to the
filter... then there is the internal Context I think which shuts down on the IO
thread.

+}
+
+bool VRMessageFilter::OnMessageReceived(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(VRMessageFilter, message)
+    IPC_MESSAGE_HANDLER(VRMsg_GetVRDevices,
+        OnGetVRDevices)
+    IPC_MESSAGE_HANDLER(VRMsg_GetHMDSensorState,
+        OnGetHMDSensorState)
+    IPC_MESSAGE_HANDLER(VRMsg_ResetSensor,
+        OnResetSensor)
+    IPC_MESSAGE_HANDLER(VRMsg_GetRenderTargetRects,
+        OnGetRenderTargetRects)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void VRMessageFilter::OnGetVRDevices(
+    std::vector<blink::WebVRDevice>* devices) {
+  VRService::GetInstance()->GetVRDevices(devices);
+}
+
+void VRMessageFilter::OnGetHMDSensorState(
+    unsigned int index, blink::WebHMDSensorState* state) {
+  VRDevice* device = VRService::GetInstance()->GetDevice(index);
+  if (device) {
+    device->GetHMDSensorState(state);
+  }
+}
+
+void VRMessageFilter::OnResetSensor(unsigned int index) {
+  VRDevice* device = VRService::GetInstance()->GetDevice(index);
+  if (device) {
+    device->ResetSensor();
+  }
+}
+
+void VRMessageFilter::OnGetRenderTargetRects(
+    unsigned index,
+    blink::WebVRFieldOfView leftFov,
+    blink::WebVRFieldOfView rightFov,
+    blink::WebVRVector4* leftRect,
+    blink::WebVRVector4* rightRect) {
+  VRDevice* device = VRService::GetInstance()->GetDevice(index);
+  if (device) {
+    device->GetRenderTargetRects(leftFov, rightFov, leftRect, rightRect);
+  }
+}
+
+}  // namespace content