Add package root setting to analysis server API.

editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/AnalysisServer.java

Index: editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/AnalysisServer.java
diff --git a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/AnalysisServer.java b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/AnalysisServer.java
index 1c75875128d3d9ccd295f742a0aea6c6d41d8fa2..3b1283ff8a3f3e83d67fe5f80167917dfc0635e1 100644
--- a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/AnalysisServer.java
+++ b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/AnalysisServer.java
@@ -103,8 +103,16 @@ public interface AnalysisServer {
    * @param included A list of the files and directories that should be analyzed.
    * @param excluded A list of the files and directories within the included directories that should
    *         not be analyzed.
+   * @param packageRoots A mapping from source directories to target directories that should override
+   *         the normal package: URI resolution mechanism. The analyzer will behave as though each
+   *         source directory in the map contains a special pubspec.yaml file which resolves any
+   *         package: URI to the corresponding path within the target directory. The effect is the
+   *         same as specifying the target directory as a "--package_root" parameter to the Dart VM
+   *         when executing any Dart file inside the source directory. If this field is absent, or
+   *         the empty map is specified, then all package: URI's are resolved the normal pubspec.yaml
+   *         mechanism.
    */
-  public void analysis_setAnalysisRoots(List<String> included, List<String> excluded);
+  public void analysis_setAnalysisRoots(List<String> included, List<String> excluded, Map<String, String> packageRoots);
 
   /**
    * {@code analysis.setPriorityFiles}