Add an option to enable Partial translate on incognito

Bug: 1456860
Change-Id: I76571e967055d98a1b10146b0dcf0f2a7bd5c499
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4634137
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1160810}

ios/chrome/browser/flags/about_flags.mm

@@ -648,9 +648,13 @@ const FeatureEntry::FeatureVariation
 
 const FeatureEntry::FeatureParam kIOSEditMenuPartialTranslateNoIncognito[] = {
     {kIOSEditMenuPartialTranslateNoIncognitoParam, "true"}};
+const FeatureEntry::FeatureParam kIOSEditMenuPartialTranslateWithIncognito[] = {
+    {kIOSEditMenuPartialTranslateNoIncognitoParam, "false"}};
 const FeatureEntry::FeatureVariation kIOSEditMenuPartialTranslateVariations[] =
     {{"Disable on incognito", kIOSEditMenuPartialTranslateNoIncognito,
-      std::size(kIOSEditMenuPartialTranslateNoIncognito), nullptr}};
+      std::size(kIOSEditMenuPartialTranslateNoIncognito), nullptr},
+     {"Enable on incognito", kIOSEditMenuPartialTranslateWithIncognito,
+      std::size(kIOSEditMenuPartialTranslateWithIncognito), nullptr}};
 
 const FeatureEntry::FeatureParam kAddToHomeScreenDisableIncognito[] = {
     {kAddToHomeScreenDisableIncognitoParam, "true"}};