Fix bug, always keep fIsScaleTranslate in correct state

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 551ca60742b3a6e280306bf92b8998d1e84c3251..d089fbc2b99175b105dfb775193bd06045eb37bd 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -1488,12 +1488,12 @@ void SkCanvas::concat(const SkMatrix& matrix) {
 void SkCanvas::internalSetMatrix(const SkMatrix& matrix) {
     fDeviceCMDirty = true;
     fMCRec->fMatrix = matrix;
+    fIsScaleTranslate = matrix.isScaleTranslate();
 }
 
 void SkCanvas::setMatrix(const SkMatrix& matrix) {
     this->checkForDeferredSave();
     this->internalSetMatrix(matrix);
-    fIsScaleTranslate = matrix.isScaleTranslate();
     this->didSetMatrix(matrix);
 }