Implement DisplayListDispatcher::transformReset.

display_list/display_list_dispatcher.cc

@@ -281,6 +281,11 @@ void DisplayListDispatcher::transformFullPerspective(SkScalar mxx,
   canvas_.Transform(xformation);
 }
 
+// |flutter::Dispatcher|
+void DisplayListDispatcher::transformReset() {
+  canvas_.ResetTransform();
+}
+
 static Rect ToRect(const SkRect& rect) {
   return Rect::MakeLTRB(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
 }

display_list/display_list_dispatcher.h

@@ -116,6 +116,9 @@ class DisplayListDispatcher final : public flutter::Dispatcher {
                                 SkScalar mwz,
                                 SkScalar mwt) override;
 
+  // |flutter::Dispatcher|
+  void transformReset() override;
+
   // |flutter::Dispatcher|
   void clipRect(const SkRect& rect, SkClipOp clip_op, bool is_aa) override;