Fix the Skia roll - implement onWritePixels

Test: None

https://skia-review.googlesource.com/c/skia/+/105623 added a new
abstract method to SkSurface_Base, so these subclasses needs to
implement it. Implementation is empty just to get the roll fixed.

Change-Id: Ib6029acf40feb47a572cd6e18678b08a6f38fe4b
diff --git a/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp b/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp
index 182e364..15c0ab1 100644
--- a/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp
+++ b/libs/hwui/tests/unit/RenderNodeDrawableTests.cpp
@@ -471,6 +471,7 @@
         sk_sp<SkSurface> onNewSurface(const SkImageInfo&) override { return nullptr; }
         void onCopyOnWrite(ContentChangeMode) override {}
         int* mDrawCounter;
+        void onWritePixels(const SkPixmap&, int x, int y) {}
     };
 
     auto receiverBackground = TestUtils::createSkiaNode(