Get rid of getCTM/setCTM pair in Font::paintGlyphsVertical

Source/platform/graphics/GraphicsContextStateSaver.h

Index: Source/platform/graphics/GraphicsContextStateSaver.h
diff --git a/Source/platform/graphics/GraphicsContextStateSaver.h b/Source/platform/graphics/GraphicsContextStateSaver.h
index 7134a98d938e44a9e0041b120a4cebc24238a54d..53e1105d01d5491af1d7ebb1845690581acae01f 100644
--- a/Source/platform/graphics/GraphicsContextStateSaver.h
+++ b/Source/platform/graphics/GraphicsContextStateSaver.h
@@ -80,6 +80,26 @@ private:
     bool m_saveAndRestore;
 };
 
+class GraphicsContextCTMSaver {
+public:
+    GraphicsContextCTMSaver(GraphicsContext& context)
+        : m_canvas(context.contextDisabled() ? nullptr : context.canvas())
+    {
+        if (m_canvas)
+            m_savedMatrix = m_canvas->getTotalMatrix();
+    }
+
+    ~GraphicsContextCTMSaver()
+    {
+        if (m_canvas)
+            m_canvas->setMatrix(m_savedMatrix);
+    }
+
+private:
+    SkMatrix m_savedMatrix;
+    SkCanvas* m_canvas;
+};
+
 } // namespace blink
 
 #endif // GraphicsContextStateSaver_h