constructor completion: implement anonymous methods after arg live template (IDEA-CR-14717)

java/java-tests/testData/codeInsight/completion/signature/AnonymousNonDefaultConstructor.java

@@ -2,6 +2,8 @@ abstract class Foo{
     public Foo(int x) {
     }
 
+    abstract int foo();
+
     {
         Foo f = new F<caret>
     }

java/java-tests/testData/codeInsight/completion/signature/AnonymousNonDefaultConstructor_after.java

@@ -2,6 +2,8 @@ abstract class Foo{
     public Foo(int x) {
     }
 
+    abstract int foo();
+
     {
         Foo f = new Foo(<selection>x</selection><caret>) {}
     }

java/java-tests/testData/codeInsight/completion/signature/AnonymousNonDefaultConstructor_afterTemplate.java

@@ -0,0 +1,15 @@
+abstract class Foo{
+    public Foo(int x) {
+    }
+
+    abstract int foo();
+
+    {
+        Foo f = new Foo(x) {
+            @Override
+            int foo() {
+                return 0;
+            }
+        }
+    }
+}