Create a subset of skia support for paths only

pdfium.gni

Index: pdfium.gni
diff --git a/pdfium.gni b/pdfium.gni
index ede452ff1a83006a88e660d4886d8e695d78adce..df051eca81ba5baa1e89b88184687ccbc74d52c4 100644
--- a/pdfium.gni
+++ b/pdfium.gni
@@ -17,9 +17,12 @@ declare_args() {
   # Build PDFium either with or without XFA Forms support.
   pdf_enable_xfa = pdf_enable_xfa_override
 
-  # Build PDFium against skia (experimental) rather than agg.
+  # Build PDFium against skia (experimental) rather than agg. Use Skia to draw everything.
   pdf_use_skia = pdf_use_skia_override
 
+  # Build PDFium against skia (experimental) rather than agg. Use Skia to draw paths.
+  pdf_use_skia_paths = pdf_use_skia_paths_override
+
   # Build PDFium with or without experimental win32 GDI APIs.
   pdf_use_win32_gdi = pdf_use_win32_gdi_override