SkScalerContextRec::computeMatrices to return status.

src/ports/SkFontHost_mac.cpp

Index: src/ports/SkFontHost_mac.cpp
diff --git a/src/ports/SkFontHost_mac.cpp b/src/ports/SkFontHost_mac.cpp
index 842c5e6b71747fa40ecff7e92fbcc663f56b8caa..93255df920f328cbb4d78c45583dc40a4509e79b 100644
--- a/src/ports/SkFontHost_mac.cpp
+++ b/src/ports/SkFontHost_mac.cpp
@@ -807,10 +807,16 @@ SkScalerContext_Mac::SkScalerContext_Mac(SkTypeface_Mac* typeface,
     // As a result, it is necessary to know the actual device size and request that.
     SkVector scale;
     SkMatrix skTransform;
-    fRec.computeMatrices(SkScalerContextRec::kVertical_PreMatrixScale, &scale, &skTransform,
-                         nullptr, nullptr, &fFUnitMatrix);
+    bool invertable = fRec.computeMatrices(SkScalerContextRec::kVertical_PreMatrixScale,
+                                           &scale, &skTransform, nullptr, nullptr, &fFUnitMatrix);
     fTransform = MatrixToCGAffineTransform(skTransform);
-    fInvTransform = CGAffineTransformInvert(fTransform);
+    // CGAffineTransformInvert documents that if the transform is non-invertible it will return the
+    // passed transform unchanged. It does so, but then also prints a message to stdout. Avoid this.
+    if (invertable) {
+        fInvTransform = CGAffineTransformInvert(fTransform);
+    } else {
+        fInvTransform = fTransform;
+    }
 
     // The transform contains everything except the requested text size.
     // Some properties, like 'trak', are based on the text size (before applying the matrix).