Bug 1299606: Diagnostic, trivial patch. Our messages were not unique. r=me

gfx/layers/client/TextureClient.cpp

@@ -883,7 +883,7 @@ TextureClient::InitIPDLActor(CompositableForwarder* aForwarder)
       // It's Ok for a texture to move from a ShadowLayerForwarder to another, but
       // not form a CompositorBridgeChild to another (they use different channels).
       if (currentTexFwd && currentTexFwd != aForwarder->AsTextureForwarder()) {
-        gfxCriticalError() << "Attempt to move a texture to a different channel.";
+        gfxCriticalError() << "Attempt to move a texture to a different channel CF.";
         return false;
       }
       if (currentFwd && currentFwd->GetCompositorBackendType() != aForwarder->GetCompositorBackendType()) {
@@ -940,7 +940,7 @@ TextureClient::InitIPDLActor(TextureForwarder* aForwarder, LayersBackend aBacken
     }
 
     if (currentTexFwd && currentTexFwd != aForwarder) {
-      gfxCriticalError() << "Attempt to move a texture to a different channel.";
+      gfxCriticalError() << "Attempt to move a texture to a different channel TF.";
       return false;
     }
     mActor->mTextureForwarder = aForwarder;