XFA: Manual merge of Clean up IFX_BidiChar

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 1ab969a9278d8a8918c7ff328e45c07487a0f255..00b4775830df3ccc1ff0dacc3d28aa40d69f2462 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -467,6 +467,7 @@ static_library("fxcrt") {
   sources = [
     "core/include/fxcrt/fx_arb.h",
     "core/include/fxcrt/fx_basic.h",
+    "core/include/fxcrt/fx_bidi.h",
     "core/include/fxcrt/fx_coordinates.h",
     "core/include/fxcrt/fx_ext.h",
     "core/include/fxcrt/fx_memory.h",
@@ -491,6 +492,7 @@ static_library("fxcrt") {
     "core/src/fxcrt/fx_basic_utf.cpp",
     "core/src/fxcrt/fx_basic_util.cpp",
     "core/src/fxcrt/fx_basic_wstring.cpp",
+    "core/src/fxcrt/fx_bidi.cpp",
     "core/src/fxcrt/fx_extension.cpp",
     "core/src/fxcrt/fx_ucddata.cpp",
     "core/src/fxcrt/fx_unicode.cpp",
@@ -1477,6 +1479,7 @@ test("pdfium_unittests") {
     "core/src/fxcrt/fx_basic_bstring_unittest.cpp",
     "core/src/fxcrt/fx_basic_memmgr_unittest.cpp",
     "core/src/fxcrt/fx_basic_wstring_unittest.cpp",
+    "core/src/fxcrt/fx_bidi_unittest.cpp",
     "core/src/fxcrt/fx_system_unittest.cpp",
     "third_party/base/nonstd_unique_ptr_unittest.cpp",
     "xfa/src/fxbarcode/pdf417/BC_PDF417HighLevelEncoder_unittest.cpp",