Support Package Resolution Configuration files.

tests/compiler/dart2js/memory_compiler.dart

Index: tests/compiler/dart2js/memory_compiler.dart
diff --git a/tests/compiler/dart2js/memory_compiler.dart b/tests/compiler/dart2js/memory_compiler.dart
index 482bb7c78520edd748ef4768e286d7cc7dc5467d..b9de4fea658575713c0cde1dbfeac567e9c0f4ea 100644
--- a/tests/compiler/dart2js/memory_compiler.dart
+++ b/tests/compiler/dart2js/memory_compiler.dart
@@ -110,7 +110,7 @@ Compiler compilerFor(Map<String,String> memorySourceFiles,
     expando[readStringFromUri] = provider;
   } else {
     // When using a cached compiler, it has read a number of files from disk
-    // already (and will not attemp to read them again due to caching). These
+    // already (and will not attempt to read them again due to caching). These
     // files must be available to the new diagnostic handler.
     provider = expando[cachedCompiler.provider];
     readStringFromUri = cachedCompiler.provider;