--- a/gfx/layers/CompositorTypes.h
+++ b/gfx/layers/CompositorTypes.h
@@ -190,16 +190,28 @@ struct TextureFactoryIdentifier
     , mMaxTextureSize(aMaxTextureSize)
     , mCompositorUseANGLE(aCompositorUseANGLE)
     , mSupportsTextureBlitting(aSupportsTextureBlitting)
     , mSupportsPartialUploads(aSupportsPartialUploads)
     , mSupportsComponentAlpha(aSupportsComponentAlpha)
     , mSupportsBackdropCopyForComponentAlpha(true)
     , mSyncHandle(aSyncHandle)
   {}
+
+  bool operator==(const TextureFactoryIdentifier& aOther) const {
+    return
+      mParentBackend == aOther.mParentBackend &&
+      mParentProcessType == aOther.mParentProcessType &&
+      mMaxTextureSize == aOther.mMaxTextureSize &&
+      mCompositorUseANGLE == aOther.mCompositorUseANGLE &&
+      mSupportsTextureBlitting == aOther.mSupportsTextureBlitting &&
+      mSupportsPartialUploads == aOther.mSupportsPartialUploads &&
+      mSupportsComponentAlpha == aOther.mSupportsComponentAlpha &&
+      mSyncHandle == aOther.mSyncHandle;
+  }
 };
 
 /**
  * Information required by the compositor from the content-side for creating or
  * using compositables and textures.
  * XXX - TextureInfo is a bad name: this information is useful for the compositable,
  * not the Texture. And ith new Textures, only the compositable type is really
  * useful. This may (should) be removed in the near future.