[Password Generation] Send a boolean flag of whether user changed generated password

components/autofill/core/browser/proto/server.proto

Index: components/autofill/core/browser/proto/server.proto
diff --git a/components/autofill/core/browser/proto/server.proto b/components/autofill/core/browser/proto/server.proto
index e84e2025a79e469343d30a88e1d8b12c86191336..ee556e5b1743ee2cbe7783706d6cdc365d220e8f 100644
--- a/components/autofill/core/browser/proto/server.proto
+++ b/components/autofill/core/browser/proto/server.proto
@@ -33,7 +33,7 @@ message AutofillQueryResponseContents {
 
 // This message contains information about the field types in a single form.
 // It is sent by the toolbar to contribute to the field type statistics.
-// Next available id: 22
+// Next available id: 23
 message AutofillUploadContents {
   required string client_version = 1;
   required fixed64 form_signature = 2;
@@ -98,6 +98,10 @@ message AutofillUploadContents {
     // The value of the id attribute, if it differs from the name attribute.
     // Otherwise, this field is absent.
     optional string id = 21;
+
+    // True iff the user changed generated password. If there was no generation,
+    // the field is absent.
+    optional bool generated_password_changed = 22;
   }
   // Signature of the form action host (e.g. Hash64Bit("example.com")).
   optional fixed64 action_signature = 13;