Adding Chrome-side WebVR interface

content/browser/renderer_host/vr_message_filter.cc

Index: content/browser/renderer_host/vr_message_filter.cc
diff --git a/content/browser/renderer_host/vr_message_filter.cc b/content/browser/renderer_host/vr_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..56b582ba3b65bfce1d0c6499c5c31e854bcbdb28
--- /dev/null
+++ b/content/browser/renderer_host/vr_message_filter.cc
@@ -0,0 +1,72 @@
+// 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() {
+}
+
+void VRMessageFilter::OnDestruct() const {
+  BrowserThread::DeleteOnIOThread::Destruct(this);
+}
+
+bool VRMessageFilter::OnMessageReceived(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(VRMessageFilter, message)
+    IPC_MESSAGE_HANDLER(VRHostMsg_GetVRDevices,
+        OnGetVRDevices)
+    IPC_MESSAGE_HANDLER(VRHostMsg_GetSensorState,
+        OnGetSensorState)
+    IPC_MESSAGE_HANDLER(VRHostMsg_ResetSensor,
+        OnResetSensor)
+    IPC_MESSAGE_HANDLER(VRHostMsg_GetRenderTargetRects,
+        OnGetRenderTargetRects)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void VRMessageFilter::OnGetVRDevices(
+    std::vector<blink::WebVRDevice>* devices) {
+  GetServiceInstance()->GetVRDevices(devices);
+}
+
+void VRMessageFilter::OnGetSensorState(
+    unsigned int index, blink::WebHMDSensorState* state) {
+  VRDevice* device = GetServiceInstance()->GetDevice(index);
+  if (device) {
+    device->GetSensorState(state);

[jdduke (slow), 2015/03/30 15:19:47]

So, these methods appear to be getting called on the IO thread. Are Android's
HeadMountedDisplay and HeadMountedDisplayManager both completely thread safe?

+  }
+}
+
+void VRMessageFilter::OnResetSensor(unsigned int index) {
+  VRDevice* device = GetServiceInstance()->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 = GetServiceInstance()->GetDevice(index);
+  if (device) {
+    device->GetRenderTargetRects(leftFov, rightFov, leftRect, rightRect);

[jdduke (slow), 2015/03/30 15:19:47]

Apologies if you've already gone over this, but I don't see where these
variables are getting consumed? Where do we forward the fetched data?

+  }
+}
+
+}  // namespace content