Add feature::kEnableIncognitoWindowCounter for incognito window count.

A feature and flag is added to control adding an incognito window
counter to the incognito icon on toolbar.

Bug: 896235
Change-Id: Ic0766f2344d9caefc7ede1e5266df053d32ef2d5
Reviewed-on: https://chromium-review.googlesource.com/c/1286423
Commit-Queue: Ramin Halavati <[email protected]>
Reviewed-by: Ramin Halavati <[email protected]>
Reviewed-by: Martin Šrámek <[email protected]>
Cr-Commit-Position: refs/heads/master@{#600751}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 95554d76..7f47a2e 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -526,6 +526,9 @@
 extern const char kEnableImageCaptureAPIName[];
 extern const char kEnableImageCaptureAPIDescription[];
 
+extern const char kEnableIncognitoWindowCounterName[];
+extern const char kEnableIncognitoWindowCounterDescription[];
+
 extern const char kEnableZeroSuggestRedirectToChromeName[];
 extern const char kEnableZeroSuggestRedirectToChromeDescription[];