DevTools: [PrettyPrint] support arrow function

third_party/WebKit/LayoutTests/inspector/sources/pretty-print-javascript-6.html

Index: third_party/WebKit/LayoutTests/inspector/sources/pretty-print-javascript-6.html
diff --git a/third_party/WebKit/LayoutTests/inspector/sources/pretty-print-javascript-6.html b/third_party/WebKit/LayoutTests/inspector/sources/pretty-print-javascript-6.html
index 29237ce7642c0d7b91293edfca8a2ff31f63bc3c..2d0bc5f3b9004a3350ecd3348bcd118c83362dad 100644
--- a/third_party/WebKit/LayoutTests/inspector/sources/pretty-print-javascript-6.html
+++ b/third_party/WebKit/LayoutTests/inspector/sources/pretty-print-javascript-6.html
@@ -46,6 +46,12 @@ function test()
         {
             var mappingQueries = ["setTimeout", "function", "alert", "2000"];
             testJSFormatter("setTimeout(function(){alert(1);},2000);", mappingQueries, next);
+        },
+
+        function arrowFunction(next)
+        {
+            var mappingQueries = ["function", "console", "=>", "2"];
+            testJSFormatter("function test(arg){console.log(arg);}test(a=>a+2);", mappingQueries, next);
         }
     ]);
 }