diff --git a/impeller/golden_tests/golden_playground_test.h b/impeller/golden_tests/golden_playground_test.h
index 9754d943be655..0124d86108ea9 100644
--- a/impeller/golden_tests/golden_playground_test.h
+++ b/impeller/golden_tests/golden_playground_test.h
@@ -57,6 +57,9 @@ class GoldenPlaygroundTest
 
   ISize GetWindowSize() const;
 
+ protected:
+  void SetWindowSize(ISize size);
+
  private:
 #if FML_OS_MACOSX
   // This must be placed first so that the autorelease pool is not destroyed
diff --git a/impeller/golden_tests/golden_playground_test_mac.cc b/impeller/golden_tests/golden_playground_test_mac.cc
index e7f0c0fb7b6b7..b2a7fd47d96ad 100644
--- a/impeller/golden_tests/golden_playground_test_mac.cc
+++ b/impeller/golden_tests/golden_playground_test_mac.cc
@@ -193,4 +193,8 @@ ISize GoldenPlaygroundTest::GetWindowSize() const {
   return pimpl_->window_size;
 }
 
+void GoldenPlaygroundTest::GoldenPlaygroundTest::SetWindowSize(ISize size) {
+  pimpl_->window_size = size;
+}
+
 }  // namespace impeller
diff --git a/impeller/golden_tests/golden_playground_test_stub.cc b/impeller/golden_tests/golden_playground_test_stub.cc
index fe7a931c112f9..7827d9c5e1007 100644
--- a/impeller/golden_tests/golden_playground_test_stub.cc
+++ b/impeller/golden_tests/golden_playground_test_stub.cc
@@ -64,4 +64,6 @@ ISize GoldenPlaygroundTest::GetWindowSize() const {
   return ISize();
 }
 
+void GoldenPlaygroundTest::SetWindowSize(ISize size) {}
+
 }  // namespace impeller
diff --git a/impeller/playground/playground.h b/impeller/playground/playground.h
index 039777a590a55..27b483f6d2da3 100644
--- a/impeller/playground/playground.h
+++ b/impeller/playground/playground.h
@@ -92,6 +92,8 @@ class Playground {
 
   virtual bool ShouldKeepRendering() const;
 
+  void SetWindowSize(ISize size);
+
  private:
   struct GLFWInitializer;
 
@@ -105,8 +107,6 @@ class Playground {
 
   void SetCursorPosition(Point pos);
 
-  void SetWindowSize(ISize size);
-
   FML_DISALLOW_COPY_AND_ASSIGN(Playground);
 };