Adding Chrome-side WebVR interface

content/common/vr_messages.h

Index: content/common/vr_messages.h
diff --git a/content/common/vr_messages.h b/content/common/vr_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..d0215d7ee13d125fa9fc5d41a9b04e5be577ca06
--- /dev/null
+++ b/content/common/vr_messages.h
@@ -0,0 +1,65 @@
+// 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.
+
+// Multiply-included message file, no include guard.
+
+#include <vector>
+
+#include "content/common/vr_param_traits.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_param_traits.h"
+#include "ipc/ipc_platform_file.h"
+#include "third_party/WebKit/public/platform/WebVR.h"
+
+#define IPC_MESSAGE_START VRMsgStart
+
+IPC_STRUCT_TRAITS_BEGIN(blink::WebVRVector3)
+  IPC_STRUCT_TRAITS_MEMBER(x)
+  IPC_STRUCT_TRAITS_MEMBER(y)
+  IPC_STRUCT_TRAITS_MEMBER(z)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(blink::WebVRVector4)
+  IPC_STRUCT_TRAITS_MEMBER(x)
+  IPC_STRUCT_TRAITS_MEMBER(y)
+  IPC_STRUCT_TRAITS_MEMBER(z)
+  IPC_STRUCT_TRAITS_MEMBER(w)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(blink::WebVRFieldOfView)
+  IPC_STRUCT_TRAITS_MEMBER(upDegrees)
+  IPC_STRUCT_TRAITS_MEMBER(downDegrees)
+  IPC_STRUCT_TRAITS_MEMBER(leftDegrees)
+  IPC_STRUCT_TRAITS_MEMBER(rightDegrees)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(blink::WebHMDSensorState)
+  IPC_STRUCT_TRAITS_MEMBER(timestamp)
+  IPC_STRUCT_TRAITS_MEMBER(frameIndex)
+  IPC_STRUCT_TRAITS_MEMBER(flags)
+  IPC_STRUCT_TRAITS_MEMBER(orientation)
+  IPC_STRUCT_TRAITS_MEMBER(position)
+  IPC_STRUCT_TRAITS_MEMBER(angularVelocity)
+  IPC_STRUCT_TRAITS_MEMBER(linearVelocity)
+  IPC_STRUCT_TRAITS_MEMBER(angularAcceleration)
+  IPC_STRUCT_TRAITS_MEMBER(linearAcceleration)
+IPC_STRUCT_TRAITS_END()
+
+// Messages sent from the renderer to the browser.
+
+IPC_SYNC_MESSAGE_CONTROL0_1(VRHostMsg_GetVRDevices,

[Mike West, 2015/03/20 16:46:17]

Nit: Can you add some comments about what exactly these messages are doing?

+                            std::vector<blink::WebVRDevice>  /* devices */)
+
+IPC_SYNC_MESSAGE_CONTROL1_1(VRHostMsg_GetHMDSensorState,
+                            unsigned int /* index */,
+                            blink::WebHMDSensorState /* state */)
+
+IPC_MESSAGE_CONTROL1(VRHostMsg_ResetSensor, unsigned int /* index */)
+
+IPC_SYNC_MESSAGE_CONTROL3_2(VRHostMsg_GetRenderTargetRects,
+                            unsigned int /* index */,
+                            blink::WebVRFieldOfView /* leftFov */,
+                            blink::WebVRFieldOfView /* rightFov */,
+                            blink::WebVRVector4 /* leftRect */,
+                            blink::WebVRVector4 /* rightRect */)