Prepare SourceDatabase API for lazy file loading

crates/ra_cli/src/analysis_bench.rs

@@ -8,7 +8,7 @@ use std::{
 
 use ra_db::{
     salsa::{Database, Durability},
-    FileId, SourceDatabase,
+    FileId, SourceDatabaseExt,
 };
 use ra_ide_api::{Analysis, AnalysisChange, AnalysisHost, FilePosition, LineCol};
 

crates/ra_cli/src/analysis_stats.rs

@@ -2,7 +2,7 @@
 
 use std::{collections::HashSet, fmt::Write, path::Path, time::Instant};
 
-use ra_db::SourceDatabase;
+use ra_db::SourceDatabaseExt;
 use ra_hir::{AssocItem, Crate, HasBodySource, HasSource, HirDisplay, ModuleDef, Ty, TypeWalk};
 use ra_syntax::AstNode;