Measure how often PSL and same-organization name credentials are suppressed.

components/password_manager/core/browser/form_fetcher.h

Index: components/password_manager/core/browser/form_fetcher.h
diff --git a/components/password_manager/core/browser/form_fetcher.h b/components/password_manager/core/browser/form_fetcher.h
index 05400dc8b1cd3df8d51be7fa722224fd0767138b..22bcd52aa554ec105fb0a930bf79712d11d89c91 100644
--- a/components/password_manager/core/browser/form_fetcher.h
+++ b/components/password_manager/core/browser/form_fetcher.h
@@ -71,22 +71,41 @@ class FormFetcher {
   virtual const std::vector<const autofill::PasswordForm*>&
   GetFederatedMatches() const = 0;
 
-  // When this instance fetches forms for an HTTP origin: Returns credentials,
-  // if any, found for the HTTPS version of that origin. These results are
-  // queried on a best-effort basis, might be somewhat stale, and are normally
-  // available shortly after the first Consumer::ProcessMatches callback.
+  // The following accessors return various kinds of `suppressed` credentials.
+  // These are stored credentials that are not (auto-)filled, because they are
+  // for an origin that is similar to, but not exactly matching the origin that
+  // this FormFetcher was created for. They are used for recording metrics on
+  // how often such -- potentially, but not necessarily related -- credentials
+  // are not offered to the user, unduly increasing log-in friction.
   //
-  // When there exists no precisely matching HTTP credentials for an origin, but
-  // there are suppressed HTTPS credentials, that could indicate a premature
-  // `move-to-HTTPS` migration, or simply that the site serves its sign-up or
-  // some of its sign-in forms over HTTPS, while others still over HTTP.
+  // There are currently three kinds of suppressed credentials:
+  //  1.) HTTPS credentials not filled on the HTTP version of the origin.
+  //  2.) PSL-matches that are not auto-filled (but filled on account select).
+  //  3.) Same-organization name credentials, not filled.
+  //
+  // Results below are queried on a best-effort basis, might be somewhat stale,
+  // and are available shortly after the Consumer::ProcessMatches callback.
+
+  // When this instance fetches forms for an HTTP origin: Returns saved
+  // credentials, if any, found for the HTTPS version of that origin. Empty
+  // otherwise.
   virtual const std::vector<const autofill::PasswordForm*>&
   GetSuppressedHTTPSForms() const = 0;
 
-  // Whether querying the results for GetSuppressedHTTPSForms was attempted and
-  // did complete at least once during the lifetime of this instance, regardless
-  // of whether there have been any suppressed HTTPS forms.
-  virtual bool DidCompleteQueryingSuppressedHTTPSForms() const = 0;
+  // Returns saved credentials, if any, for PSL-matching origins. Autofilling
+  // these is suppressed, however, they *can be* filled on account select.
+  virtual const std::vector<const autofill::PasswordForm*>&
+  GetSuppressedPSLMatchingForms() const = 0;
+
+  // Returns saved credentials, if any, found for HTTP/HTTPS origins with the
+  // same organization name as the origin this FormFetcher was created for.
+  virtual const std::vector<const autofill::PasswordForm*>&
+  GetSuppressedSameOrganizationNameForms() const = 0;
+
+  // Whether querying suppressed forms (of all flavors) was attempted and did
+  // complete at least once during the lifetime of this instance, regardless of
+  // whether there have been any results.
+  virtual bool DidCompleteQueryingSuppressedForms() const = 0;
 
   // Fetches stored matching logins. In addition the statistics is fetched on
   // platforms with the password bubble. This is called automatically during