Support secondary constructors and delegation calls in Change Signature.

Initial support of Find Usages

compiler/frontend/src/org/jetbrains/kotlin/psi/JetPsiFactory.kt

@@ -359,6 +359,11 @@ public class JetPsiFactory(private val project: Project) {
         return createClass("class A: $text").getDelegationSpecifiers().first() as JetDelegatorToSuperCall
     }
 
+    public fun createConstructorDelegationCall(text: String): JetConstructorDelegationCall {
+        val colonOrEmpty = if (text.isEmpty()) "" else ": "
+        return createClass("class A { constructor()$colonOrEmpty$text {}").getSecondaryConstructors().first().getDelegationCall()!!
+    }
+
     public inner class IfChainBuilder() {
         private val sb = StringBuilder()
         private var first = true

compiler/frontend/src/org/jetbrains/kotlin/psi/JetSecondaryConstructor.java

@@ -83,7 +83,7 @@ public class JetSecondaryConstructor extends JetDeclarationStub<KotlinPlaceHolde
     @Nullable
     @Override
     public PsiElement getColon() {
-        return null;
+        return findChildByType(JetTokens.COLON);
     }
 
     @Nullable