Initial implementation of MemoryIndexStoreImpl and IndexContributor.

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/CompilationUnit.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/CompilationUnit.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/CompilationUnit.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/CompilationUnit.java
index 07ee3941ed77b5ec7aba24091bad76bd29da42be..972d501273df3774bf1d13696ee9c02582ab86bc 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/CompilationUnit.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/ast/CompilationUnit.java
@@ -126,10 +126,10 @@ public class CompilationUnit extends ASTNode {
   }
 
   /**
-   * Return the element associated with this compilation unit, or {@code null} if the AST structure
-   * has not been resolved.
+   * Return the {@link CompilationUnitElement} associated with this compilation unit, or

[Brian Wilkerson, 2013/01/07 21:27:18]

My personal preference (which means you can ignore it) is to not use type names
in doc comments. The type is already in the signature, so duplicating it doesn't
help, and I think the text reads much better when we use English rather than
pseudo-code.

[scheglov, 2013/01/07 22:45:41]

Well, I prefer to use class names for terms which we modeled as classes instead
of just words.
I.e. use DSL-ed English :-)

Helps when you have to rename.
And such text looks more structured - you see not just several loose words
"compilation unit element", but single term.

But I should keep code style.
I'll change it to the existing (your) style.

+   * {@code null} if the AST structure has not been resolved.
    * 
-   * @return the element associated with this compilation unit
+   * @return the {@link CompilationUnitElement} associated with this compilation unit
    */
   public CompilationUnitElement getElement() {
     return element;