switch surface to sk_sp

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1817383002
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot

Review URL: https://codereview.chromium.org/1817383002
diff --git a/tools/android/SkAndroidSDKCanvas.h b/tools/android/SkAndroidSDKCanvas.h
index 68a5381..812775f 100644
--- a/tools/android/SkAndroidSDKCanvas.h
+++ b/tools/android/SkAndroidSDKCanvas.h
@@ -87,7 +87,7 @@
     bool getClipDeviceBounds(SkIRect*) const override;
     bool isClipEmpty() const override;
     bool isClipRect() const override;
-    SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override;
+    sk_sp<SkSurface> onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override;
     bool onPeekPixels(SkPixmap*) override;
     bool onAccessTopLayerPixels(SkPixmap*) override;
     void willSave() override;