Add XRSpace::ToString() to aid investigations

Change-Id: I3e5327e70bc910f3eaa7b33eea1c0f1ddeda2fc0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495970Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820942}

device/vr/android/arcore/arcore_impl.cc

@@ -1056,6 +1056,8 @@ ArCoreImpl::GetMojoFromInputSources(
 base::Optional<gfx::Transform> ArCoreImpl::GetMojoFromReferenceSpace(
     device::mojom::XRReferenceSpaceType type,
     const gfx::Transform& mojo_from_viewer) {
+  DVLOG(3) << __func__ << ": type=" << type;
+
   switch (type) {
     case device::mojom::XRReferenceSpaceType::kLocal:
       return gfx::Transform{};

third_party/blink/renderer/modules/xr/xr_frame.cc

@@ -274,6 +274,8 @@ ScriptPromise XRFrame::createAnchor(ScriptState* script_state,
     return {};
   }
 
+  DVLOG(3) << __func__ << ": space->ToString()=" << space->ToString();
+
   // The passed in space may be an offset space, we need to transform the pose
   // to account for origin-offset:
   auto native_origin_from_offset_space = space->NativeFromOffsetMatrix();

third_party/blink/renderer/modules/xr/xr_grip_space.cc

@@ -46,6 +46,10 @@ bool XRGripSpace::IsStationary() const {
   return false;
 }
 
+std::string XRGripSpace::ToString() const {
+  return "XRGripSpace";
+}
+
 void XRGripSpace::Trace(Visitor* visitor) const {
   visitor->Trace(input_source_);
   XRSpace::Trace(visitor);

third_party/blink/renderer/modules/xr/xr_grip_space.h

@@ -22,6 +22,8 @@ class XRGripSpace : public XRSpace {
 
   bool IsStationary() const override;
 
+  std::string ToString() const override;
+
   void Trace(Visitor*) const override;
 
  private:

third_party/blink/renderer/modules/xr/xr_object_space.h

@@ -44,6 +44,8 @@ class XRObjectSpace : public XRSpace {
     return true;
   }
 
+  std::string ToString() const override { return "XRObjectSpace"; }
+
   void Trace(Visitor* visitor) const override {
     visitor->Trace(object_);
     XRSpace::Trace(visitor);

third_party/blink/renderer/modules/xr/xr_reference_space.cc

@@ -4,6 +4,8 @@
 
 #include "third_party/blink/renderer/modules/xr/xr_reference_space.h"
 
+#include <sstream>
+
 #include "device/vr/public/mojom/vr_service.mojom-blink.h"
 #include "third_party/blink/renderer/modules/xr/xr_pose.h"
 #include "third_party/blink/renderer/modules/xr/xr_reference_space_event.h"
@@ -197,6 +199,14 @@ XRReferenceSpace::NativeOrigin() const {
   return XRNativeOriginInformation::Create(this);
 }
 
+std::string XRReferenceSpace::ToString() const {
+  std::stringstream ss;
+
+  ss << "XRReferenceSpace(type=" << type_ << ")";
+
+  return ss.str();
+}
+
 void XRReferenceSpace::Trace(Visitor* visitor) const {
   visitor->Trace(origin_offset_);
   XRSpace::Trace(visitor);

third_party/blink/renderer/modules/xr/xr_reference_space.h

@@ -52,6 +52,8 @@ class XRReferenceSpace : public XRSpace {
   base::Optional<device::mojom::blink::XRNativeOriginInformation> NativeOrigin()
       const final;
 
+  std::string ToString() const override;
+
   void Trace(Visitor*) const override;
 
   virtual void OnReset();

third_party/blink/renderer/modules/xr/xr_space.h

@@ -90,6 +90,9 @@ class XRSpace : public EventTargetWithInlineData {
 
   XRSession* session() const { return session_; }
 
+  // ToString() helper, used for debugging.
+  virtual std::string ToString() const = 0;
+
   // EventTarget overrides.
   ExecutionContext* GetExecutionContext() const override;
   const AtomicString& InterfaceName() const override;

third_party/blink/renderer/modules/xr/xr_target_ray_space.cc

@@ -55,6 +55,10 @@ XRTargetRaySpace::NativeOrigin() const {
   return input_source_->nativeOrigin();
 }
 
+std::string XRTargetRaySpace::ToString() const {
+  return "XRTargetRaySpace";
+}
+
 bool XRTargetRaySpace::IsStationary() const {
   // Target ray space is a space derived off of input source, so it is not
   // considered stationary.

third_party/blink/renderer/modules/xr/xr_target_ray_space.h

@@ -22,6 +22,8 @@ class XRTargetRaySpace : public XRSpace {
 
   bool IsStationary() const override;
 
+  std::string ToString() const override;
+
   void Trace(Visitor*) const override;
 
  private: