Convert analysis starting point to an absolute path before analyzing.

pkg/analyzer/lib/src/analyzer_impl.dart

Index: pkg/analyzer/lib/src/analyzer_impl.dart
diff --git a/pkg/analyzer/lib/src/analyzer_impl.dart b/pkg/analyzer/lib/src/analyzer_impl.dart
index 40df537b7e29d2f9913865118c5d4bfec387fd18..25bac6ec833330acd646510f10e4c2a464036a81 100644
--- a/pkg/analyzer/lib/src/analyzer_impl.dart
+++ b/pkg/analyzer/lib/src/analyzer_impl.dart
@@ -68,7 +68,8 @@ class AnalyzerImpl {
   final HashMap<Source, AnalysisErrorInfo> sourceErrorsMap =
       new HashMap<Source, AnalysisErrorInfo>();
 
-  AnalyzerImpl(this.sourcePath, this.options, this.startTime) {
+  AnalyzerImpl(String sourcePath, this.options, this.startTime)
+      : sourcePath = _normalizeSourcePath(sourcePath) {
     if (sdk == null) {
       sdk = new DirectoryBasedDartSdk(new JavaFile(options.dartSdkPath));
     }
@@ -112,6 +113,13 @@ class AnalyzerImpl {
     prepareAnalysisContext(sourceFile, librarySource);
   }
 
+  /**
+   * Convert [sourcePath] into an absolute path.
+   */
+  static String _normalizeSourcePath(String sourcePath) {
+    return new File(sourcePath).absolute.path;
+  }
+
   /// The sync version of analysis.
   ErrorSeverity _analyzeSync(int printMode) {
     // don't try to analyze parts