Add logging for work items being processed.

lib/compiler/implementation/dart_backend/backend.dart

Index: lib/compiler/implementation/dart_backend/backend.dart
diff --git a/lib/compiler/implementation/dart_backend/backend.dart b/lib/compiler/implementation/dart_backend/backend.dart
index a7beccf9b31163e01aa369a16265ca5726af570a..fb02e1e100d36e40cbaf96b913e5d33585bf61b4 100644
--- a/lib/compiler/implementation/dart_backend/backend.dart
+++ b/lib/compiler/implementation/dart_backend/backend.dart
@@ -91,6 +91,7 @@ class DartBackend extends Backend {
 
   String codegen(WorkItem work) {
     // Traverse AST to populate sets of reachable classes and functions.
+    compiler.log('codegen(${work.element})');

[Roman, 2012/06/06 15:01:25]

Did you want to use your new method "log" here?
Should that method be private btw?

[Anton Muhin, 2012/06/06 15:03:42]

Of course I do, thanks a lot for spotting.

It looks like lib private methods are not that popular in this code base, so I'd
rather not.

On 2012/06/06 15:01:25, Roman wrote:

[Roman, 2012/06/06 15:05:30]

Well, that is not good. Comments are also not popular in this code base, that's
not the reason to avoid them :)

     FunctionExpression function = work.element.parseNode(compiler);
     function.body.accept(new TraversingVisitor(reachabilityVisitor));
   }
@@ -99,4 +100,6 @@ class DartBackend extends Backend {
   void assembleProgram() {
     compiler.assembledCode = '';
   }
+
+  log(String message) => compiler.log('[DartBackend] $message');
 }