Fix Skia Includes

Needed to land https://skia-review.googlesource.com/c/skia/+/532456

Change-Id: I5234878a75587cc36d882d39e9b0db99f462fd8d
diff --git a/libs/renderengine/skia/SkiaGLRenderEngine.h b/libs/renderengine/skia/SkiaGLRenderEngine.h
index af70bd4..59eeb62 100644
--- a/libs/renderengine/skia/SkiaGLRenderEngine.h
+++ b/libs/renderengine/skia/SkiaGLRenderEngine.h
@@ -43,6 +43,8 @@
 
 class SkData;
 
+struct SkPoint3;
+
 namespace android {
 namespace renderengine {
 namespace skia {