Include SkVertices.h in SkiaCanvas.h

Test: Adding IWYU header. It still builds.
Change-Id: I40df22a18fef960259b144d491f0c2f794d159b6
diff --git a/libs/hwui/SkiaCanvas.cpp b/libs/hwui/SkiaCanvas.cpp
index 5790150..1896193 100644
--- a/libs/hwui/SkiaCanvas.cpp
+++ b/libs/hwui/SkiaCanvas.cpp
@@ -40,6 +40,7 @@
 #include <SkShader.h>
 #include <SkTemplates.h>
 #include <SkTextBlob.h>
+#include <SkVertices.h>
 
 #include <memory>
 #include <optional>