[rendertext,i18n] Added flag to force RTL rendering

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 6223b4d62a02b651ce45568752a0160233dcd570..17b78dbc363780c1ee9bd57d6a84925b13ba8c7c 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -534,6 +534,14 @@ const FeatureEntry::Choice kForceUIDirectionChoices[] = {
      switches::kForceUIDirectionRTL},
 };
 
+const FeatureEntry::Choice kForceTextDirectionChoices[] = {
+    {flags_ui::kGenericExperimentChoiceDefault, "", ""},
+    {flag_descriptions::kForceUiDirectionLtr, switches::kForceTextDirection,
+     switches::kForceUIDirectionLTR},
+    {flag_descriptions::kForceUiDirectionRtl, switches::kForceTextDirection,
+     switches::kForceUIDirectionRTL},
+};
+
 #if defined(OS_ANDROID)
 const FeatureEntry::Choice kNtpSwitchToExistingTabChoices[] = {
     {flags_ui::kGenericExperimentChoiceDefault, "", ""},
@@ -2077,6 +2085,9 @@ const FeatureEntry kFeatureEntries[] = {
     {"force-ui-direction", flag_descriptions::kForceUiDirectionName,
      flag_descriptions::kForceUiDirectionDescription, kOsAll,
      MULTI_VALUE_TYPE(kForceUIDirectionChoices)},
+    {"force-text-direction", flag_descriptions::kForceTextDirectionName,
+     flag_descriptions::kForceTextDirectionDescription, kOsAll,
+     MULTI_VALUE_TYPE(kForceTextDirectionChoices)},
 #if BUILDFLAG(ENABLE_EXTENSIONS)
     {"enable-md-extensions",
      flag_descriptions::kEnableMaterialDesignExtensionsName,