Expose password blacklisted bit unencrypted via sync

This allows implementing web pages (server-side) that list user
password URLs, even if the password itself is not decryptable. The
blacklisted bit is needed because blacklisted passwords should not
be displayed together with regular ones.

Change-Id: I21ae248804dd7b43c7fda695dae7327fa30be054
Bug: 1053895
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087211
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746734}

components/sync/engine_impl/non_blocking_type_commit_contribution.cc

@@ -274,6 +274,9 @@ void NonBlockingTypeCommitContribution::AdjustCommitProto(
       encrypted_password.mutable_password()
           ->mutable_unencrypted_metadata()
           ->set_url(password_data.signon_realm());
+      encrypted_password.mutable_password()
+          ->mutable_unencrypted_metadata()
+          ->set_blacklisted(password_data.blacklisted());
     }
 
     bool result = cryptographer_->Encrypt(

components/sync/engine_impl/non_blocking_type_commit_contribution_unittest.cc

@@ -198,6 +198,10 @@ TEST(NonBlockingTypeCommitContributionTest,
   EXPECT_TRUE(entity.specifics().has_password());
   EXPECT_EQ(kSignonRealm,
             entity.specifics().password().unencrypted_metadata().url());
+  EXPECT_TRUE(
+      entity.specifics().password().unencrypted_metadata().has_blacklisted());
+  EXPECT_FALSE(
+      entity.specifics().password().unencrypted_metadata().blacklisted());
   EXPECT_FALSE(entity.specifics().password().encrypted().blob().empty());
   EXPECT_TRUE(entity.parent_id_string().empty());
   EXPECT_FALSE(entity.unique_position().has_custom_compressed_v1());

components/sync/protocol/password_specifics.proto

@@ -119,6 +119,10 @@ message PasswordSpecificsData {
 // Contains the password specifics metadata which simplifies its lookup.
 message PasswordSpecificsMetadata {
   optional string url = 1;
+
+  // True, if user chose permanently not to save the credentials for the form.
+  // Introduced in M82.
+  optional bool blacklisted = 2;
 }
 
 // Properties of password sync objects.