Update description file in Git

When writing the description to project.config, it is also necessary
to write it to the description file in the repository so the same
text is visible in cgit or gitweb.

Change-Id: Iad7b9205d6c288756f646aa453584db0bb804f9f

gerrit-server/src/main/java/com/google/gerrit/server/project/SetDescription.java

@@ -24,6 +24,7 @@ import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
 import com.google.gerrit.extensions.restapi.RestModifyView;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.MetaDataUpdate;
 import com.google.gerrit.server.git.ProjectConfig;
 import com.google.gerrit.server.project.SetDescription.Input;
@@ -41,11 +42,15 @@ class SetDescription implements RestModifyView<ProjectResource, Input> {
 
   private final ProjectCache cache;
   private final MetaDataUpdate.Server updateFactory;
+  private final GitRepositoryManager gitMgr;
 
   @Inject
-  SetDescription(ProjectCache cache, MetaDataUpdate.Server updateFactory) {
+  SetDescription(ProjectCache cache,
+      MetaDataUpdate.Server updateFactory,
+      GitRepositoryManager gitMgr) {
     this.cache = cache;
     this.updateFactory = updateFactory;
+    this.gitMgr = gitMgr;
   }
 
   @Override
@@ -84,6 +89,9 @@ class SetDescription implements RestModifyView<ProjectResource, Input> {
         md.setMessage(msg);
         config.commit(md);
         cache.evict(ctl.getProject());
+        gitMgr.setProjectDescription(
+            resource.getNameKey(),
+            project.getDescription());
 
         ListProjects.ProjectInfo info = new ListProjects.ProjectInfo();
         info.setName(resource.getName());