Add bitmaps and skp output to Skia port

samples/BUILD.gn

Index: samples/BUILD.gn
diff --git a/samples/BUILD.gn b/samples/BUILD.gn
index 9ff1bea4c1185676f0efad4356b0f02ae1448406..5e300158c9a07312d4b52c1cd51866ea9f59501a 100644
--- a/samples/BUILD.gn
+++ b/samples/BUILD.gn
@@ -9,8 +9,8 @@ import("../pdfium.gni")
 group("samples") {
   testonly = true
   deps = [
-    ":pdfium_test",
     ":pdfium_diff",
+    ":pdfium_test",
   ]
 }
 
@@ -26,6 +26,9 @@ config("pdfium_samples_config") {
   if (pdf_enable_xfa) {
     defines += [ "PDF_ENABLE_XFA" ]
   }
+  if (pdf_use_skia) {
+    defines += [ "PDF_ENABLE_SKIA" ]
+  }
 }
 
 executable("pdfium_test") {
@@ -56,6 +59,9 @@ executable("pdfium_test") {
     ]
     configs += [ "//v8:external_startup_data" ]
   }
+  if (pdf_use_skia) {
+    deps += [ "//skia" ]
+  }
   configs += [ ":pdfium_samples_config" ]
 }