Bug 758531: DWrite fonts create mScaledFont on demand. This causes GetCairoScaledFont to return NULL. This subsequently caused the surface to go into an error status which caused the CreateSimilar call to fail for that surface. This patch properly uses the call which will create the cairo_scaled_font_t if it's not there yet. r=jrmuizel

gfx/thebes/gfxDWriteFonts.cpp

@@ -763,7 +763,7 @@ gfxDWriteFont::GetScaledFont(mozilla::gfx::DrawTarget *aTarget)
   if (wantCairo) {
     mAzureScaledFont = Factory::CreateScaledFontWithCairo(nativeFont,
                                                         GetAdjustedSize(),
-                                                        GetCairoScaledFont());
+                                                        CairoScaledFont());
   } else {
     mAzureScaledFont = Factory::CreateScaledFontForNativeFont(nativeFont,
                                                             GetAdjustedSize());