--- a/gfx/layers/LayersLogging.cpp
+++ b/gfx/layers/LayersLogging.cpp
@@ -7,16 +7,17 @@
 #include "LayersLogging.h"
 #include <stdint.h>                     // for uint8_t
 #include "ImageTypes.h"                 // for ImageFormat
 #include "mozilla/gfx/Matrix.h"         // for Matrix4x4, Matrix
 #include "mozilla/gfx/Point.h"          // for IntSize
 #include "nsDebug.h"                    // for NS_ERROR
 #include "nsPoint.h"                    // for nsPoint
 #include "nsRect.h"                     // for nsRect
+#include "nsRectAbsolute.h"             // for nsRectAbsolute
 #include "base/basictypes.h"
 
 using namespace mozilla::gfx;
 
 namespace mozilla {
 namespace layers {
 
 void
@@ -64,16 +65,27 @@ AppendToString(std::stringstream& aStrea
   aStream << pfx;
   aStream << nsPrintfCString(
     "(x=%d, y=%d, w=%d, h=%d)",
     r.X(), r.Y(), r.Width(), r.Height()).get();
   aStream << sfx;
 }
 
 void
+AppendToString(std::stringstream& aStream, const nsRectAbsolute& r,
+               const char* pfx, const char* sfx)
+{
+  aStream << pfx;
+  aStream << nsPrintfCString(
+    "(l=%d, t=%d, r=%d, b=%d)",
+    r.Left(), r.Top(), r.Right(), r.Bottom()).get();
+  aStream << sfx;
+}
+
+void
 AppendToString(std::stringstream& aStream, const wr::ColorF& c,
                const char* pfx, const char* sfx)
 {
   aStream << pfx;
   aStream << nsPrintfCString(
     "rgba(%d, %d, %d, %f)",
     uint8_t(c.r*255.f), uint8_t(c.g*255.f), uint8_t(c.b*255.f), c.a).get();
   aStream << sfx;

--- a/gfx/layers/LayersLogging.h
+++ b/gfx/layers/LayersLogging.h
@@ -14,16 +14,18 @@
 #include "mozilla/gfx/Types.h"          // for SamplingFilter, SurfaceFormat
 #include "mozilla/layers/CompositorTypes.h"  // for TextureFlags
 #include "mozilla/layers/WebRenderLayersLogging.h"
 #include "nsAString.h"
 #include "nsPrintfCString.h"            // for nsPrintfCString
 #include "nsRegion.h"                   // for nsRegion, nsIntRegion
 #include "nscore.h"                     // for nsACString, etc
 
+struct nsRectAbsolute;
+
 namespace mozilla {
 
 namespace gfx {
 template <class units, class F> struct RectTyped;
 } // namespace gfx
 
 enum class ImageFormat;
 
@@ -44,16 +46,20 @@ AppendToString(std::stringstream& aStrea
 void
 AppendToString(std::stringstream& aStream, const nsPoint& p,
                const char* pfx="", const char* sfx="");
 
 void
 AppendToString(std::stringstream& aStream, const nsRect& r,
                const char* pfx="", const char* sfx="");
 
+void
+AppendToString(std::stringstream& aStream, const nsRectAbsolute& r,
+               const char* pfx="", const char* sfx="");
+
 template<class T>
 void
 AppendToString(std::stringstream& aStream, const mozilla::gfx::PointTyped<T>& p,
                const char* pfx="", const char* sfx="")
 {
   aStream << pfx << p << sfx;
 }
 
@@ -92,16 +98,40 @@ AppendToString(std::stringstream& aStrea
 {
   aStream << pfx;
   aStream << nsPrintfCString(
     "(x=%d, y=%d, w=%d, h=%d)",
     r.X(), r.Y(), r.Width(), r.Height()).get();
   aStream << sfx;
 }
 
+template<class T>
+void
+AppendToString(std::stringstream& aStream, const mozilla::gfx::RectAbsoluteTyped<T>& r,
+               const char* pfx="", const char* sfx="")
+{
+  aStream << pfx;
+  aStream << nsPrintfCString(
+    "(l=%f, t=%f, r=%f, b=%f)",
+    r.Left(), r.Top(), r.Right(), r.Bottom()).get();
+  aStream << sfx;
+}
+
+template<class T>
+void
+AppendToString(std::stringstream& aStream, const mozilla::gfx::IntRectAbsoluteTyped<T>& r,
+               const char* pfx="", const char* sfx="")
+{
+  aStream << pfx;
+  aStream << nsPrintfCString(
+    "(l=%d, t=%d, r=%d, b=%d)",
+    r.Left(), r.Top(), r.Right(), r.Bottom()).get();
+  aStream << sfx;
+}
+
 void
 AppendToString(std::stringstream& aStream, const wr::ColorF& c,
                const char* pfx="", const char* sfx="");
 
 void
 AppendToString(std::stringstream& aStream, const wr::LayoutRect& r,
                const char* pfx="", const char* sfx="");