Fast path translate() in SkCanvas and SkLiteDL.

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index 0c70f008f953b68ac6cd4ad538adc5e10ac6e5a9..ce5a3b5c25c7ee19c491473970989ae85c905191 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -1390,6 +1390,9 @@ protected:
     virtual void didRestore() {}
     virtual void didConcat(const SkMatrix&) {}
     virtual void didSetMatrix(const SkMatrix&) {}
+    virtual void didTranslate(SkScalar dx, SkScalar dy) {
+        this->didConcat(SkMatrix::MakeTrans(dx, dy));
+    }
 
 #ifdef SK_EXPERIMENTAL_SHADOWING
     virtual void didTranslateZ(SkScalar) {}