Revert "[IME] Remove IME UIL flags."

This reverts commit 20fb36e3013a858109ecbf871d059e32edae1816.

Reason for revert: speculative revert for chrome_all_tast_tests
failures affecting inputs.VirtualKeyboard* tests, for example
https://ci.chromium.org/p/chrome/builders/ci/chromeos-betty-pi-arc-chrome/9751

Original change's description:
> [IME] Remove IME UIL flags.
>
> Simplify the UIL/IME service dev/testing.
>
> TEST=simple chrome
> BUG=b/171846787
>
> Change-Id: Ibeef37bc89b848cffd5a4a08d5619d41a5c35b33
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507236
> Reviewed-by: Darren Shen <[email protected]>
> Commit-Queue: Leo Zhang <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#822479}

[email protected],[email protected],[email protected]

Change-Id: I2c2a4ccda60320dd7099afcfc28a12122b11e982
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/171846787
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509749
Reviewed-by: Mikel Astiz <[email protected]>
Commit-Queue: Mikel Astiz <[email protected]>
Cr-Commit-Position: refs/heads/master@{#822582}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 1de19f53..e1ec2e1 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -4228,6 +4228,18 @@
 const char kImeEmojiSuggestAdditionDescription[] =
     "Enable emoji suggestion as addition to the text written for native IME.";
 
+const char kImeInputLogicFstName[] = "Enable FST Input Logic on IME";
+const char kImeInputLogicFstDescription[] =
+    "Enable FST Input Logic to replace the IME legacy input logic on NaCl";
+
+const char kImeInputLogicHmmName[] = "Enable HMM Input Logic on IME";
+const char kImeInputLogicHmmDescription[] =
+    "Enable HMM Input Logic to replace the IME legacy input logic on NaCl";
+
+const char kImeInputLogicMozcName[] = "Enable MOZC Input Logic on IME";
+const char kImeInputLogicMozcDescription[] =
+    "Enable MOZC Input Logic to replace the IME legacy input logic on NaCl";
+
 const char kImeMozcProtoName[] = "Enable protobuf on Japanese IME";
 const char kImeMozcProtoDescription[] =
     "Enable Japanese IME to use protobuf as interactive message format to "