[Password Manager] Add UMA stats to track interaction with synced accounts.

components/password_manager/core/browser/password_manager_client.h

Index: components/password_manager/core/browser/password_manager_client.h
diff --git a/components/password_manager/core/browser/password_manager_client.h b/components/password_manager/core/browser/password_manager_client.h
index a3579e789aef850fb55c8b77814be6d6ce54e64a..e6aa8317e0a6da3837cede76510ebe2151b9c3f8 100644
--- a/components/password_manager/core/browser/password_manager_client.h
+++ b/components/password_manager/core/browser/password_manager_client.h
@@ -34,6 +34,11 @@ class PasswordManagerClient {
   // always returns true.
   virtual bool IsPasswordManagerEnabledForCurrentPage() const;
 
+  // Returns true if |username| and |origin| correspond to the account which is
+  // syncing passwords.
+  virtual bool IsPasswordSyncAccountCredential(
+      const std::string& username, const std::string& origin) const = 0;
+
   // Informs the embedder of a password form that can be saved if the user
   // allows it. The embedder is not required to prompt the user if it decides
   // that this form doesn't need to be saved.