Add getStatementCompletion to the API spec

pkg/analysis_server/test/integration/protocol_matchers.dart

Index: pkg/analysis_server/test/integration/protocol_matchers.dart
diff --git a/pkg/analysis_server/test/integration/protocol_matchers.dart b/pkg/analysis_server/test/integration/protocol_matchers.dart
index 5ba971d6d1c1351ba3c5f0f46eb936b75a3f271d..f7cac63019ddab5d3d7f7050091d32e7a42d732f 100644
--- a/pkg/analysis_server/test/integration/protocol_matchers.dart
+++ b/pkg/analysis_server/test/integration/protocol_matchers.dart
@@ -809,6 +809,30 @@ final Matcher isEditGetRefactoringResult =
         }));
 
 /**
+ * edit.getStatementCompletion params
+ *
+ * {
+ *   "file": FilePath
+ *   "offset": int
+ * }
+ */
+final Matcher isEditGetStatementCompletionParams = new LazyMatcher(() =>
+    new MatchesJsonObject("edit.getStatementCompletion params",
+        {"file": isFilePath, "offset": isInt}));
+
+/**
+ * edit.getStatementCompletion result
+ *
+ * {
+ *   "change": SourceChange
+ *   "whitespaceOnly": bool
+ * }
+ */
+final Matcher isEditGetStatementCompletionResult = new LazyMatcher(() =>
+    new MatchesJsonObject("edit.getStatementCompletion result",
+        {"change": isSourceChange, "whitespaceOnly": isBool}));
+
+/**
  * edit.sortMembers params
  *
  * {