Create an fxjs static library

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 98df2e39c7c6c125d69f8c3cc51240e742b5f10c..a45bea973c51ba3fb04a3ac726f89f4db6c5d325 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -868,6 +868,35 @@ static_library("formfiller") {
 }
 
 if (pdf_enable_xfa) {
+  static_library("fxjs") {
+    sources = [
+      "fxjs/cfxjse_arguments.cpp",
+      "fxjs/cfxjse_class.cpp",
+      "fxjs/cfxjse_context.cpp",
+      "fxjs/cfxjse_isolatetracker.cpp",
+      "fxjs/cfxjse_isolatetracker.h",
+      "fxjs/cfxjse_runtimedata.cpp",
+      "fxjs/cfxjse_runtimedata.h",
+      "fxjs/cfxjse_value.cpp",
+      "fxjs/include/cfxjse_arguments.h",
+      "fxjs/include/cfxjse_class.h",
+      "fxjs/include/cfxjse_context.h",
+      "fxjs/include/cfxjse_value.h",
+      "fxjs/include/fxjse.h",
+    ]
+    deps = [
+        "//v8:v8_libplatform",
+    ]
+    configs += [ ":pdfium_core_config" ]
+    include_dirs = [
+      "//v8",
+      "//v8/include",
+    ]
+    public_deps = [
+      "//v8",
+    ]
+  }
+
   static_library("fpdfxfa") {
     sources = [
       "fpdfsdk/fpdfxfa/fpdfxfa_app.cpp",
@@ -887,19 +916,6 @@ if (pdf_enable_xfa) {
 
   static_library("xfa") {
     sources = [
-      "fxjs/cfxjse_arguments.cpp",
-      "fxjs/cfxjse_class.cpp",
-      "fxjs/cfxjse_context.cpp",
-      "fxjs/cfxjse_isolatetracker.cpp",
-      "fxjs/cfxjse_isolatetracker.h",
-      "fxjs/cfxjse_runtimedata.cpp",
-      "fxjs/cfxjse_runtimedata.h",
-      "fxjs/cfxjse_value.cpp",
-      "fxjs/include/cfxjse_arguments.h",
-      "fxjs/include/cfxjse_class.h",
-      "fxjs/include/cfxjse_context.h",
-      "fxjs/include/cfxjse_value.h",
-      "fxjs/include/fxjse.h",
       "xfa/fde/cfde_path.cpp",
       "xfa/fde/cfde_path.h",
       "xfa/fde/cfde_txtedtbuf.cpp",
@@ -1440,14 +1456,9 @@ if (pdf_enable_xfa) {
     ]
     include_dirs = [
       ".",
-      "//v8",
-      "//v8/include",
-    ]
-    public_deps = [
-      "//v8",
     ]
     deps = [
-      "//v8:v8_libplatform",
+      ":fxjs",
     ]
     configs += [
       ":pdfium_core_config",