[inspector] fix positions for single expression arrow function

test/inspector/debugger/get-possible-breakpoints.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-// Flags: --expose-gc
 
 print("Test for Debugger.getPossibleBreakpoints");
 
 Protocol.Runtime.enable();
 Protocol.Debugger.enable();
 
 InspectorTest.runTestSuite([
+
   function getPossibleBreakpointsInRange(next) {
     var source = "function foo(){ return Promise.resolve(); }\nfunction boo(){ return Promise.resolve().then(() => 42); }\n\n";
     var scriptId;
     compileScript(source)
       .then(id => scriptId = id)
       .then(() => InspectorTest.log("Test start.scriptId != end.scriptId."))
       .then(() => Protocol.Debugger.getPossibleBreakpoints({ start: { lineNumber: 0, columnNumber: 0, scriptId: scriptId }, end: { lineNumber: 0, columnNumber: 0, scriptId: scriptId + "0" }}))
       .then(InspectorTest.logMessage)
       .then(() => InspectorTest.log("Test not existing scriptId."))
       .then(() => Protocol.Debugger.getPossibleBreakpoints({ start: { lineNumber: 0, columnNumber: 0, scriptId: "-1" }}))
@@ skipping 109 matching lines @@
       Protocol.Debugger.resume();
     });
 
     var source = `function foo5() { Promise.resolve().then(() => 42) }
 function foo6() { Promise.resolve().then(() => 42) }`;
     waitForPossibleBreakpoints(source, { lineNumber: 0, columnNumber: 0 }, undefined, { name: "with-offset.js", line_offset: 3, column_offset: 18 })
       .then(InspectorTest.logMessage)
       .then(setAllBreakpoints)
       .then(() => Protocol.Runtime.evaluate({ expression: "foo5(); foo6()"}))
       .then(next);
+  },
+
+  function arrowFunctionReturn(next) {
+    waitForPossibleBreakpoints("() => 239\n", { lineNumber: 0, columnNumber: 0 })
+      .then(InspectorTest.logMessage)
+      .then(() => waitForPossibleBreakpoints("function foo() { function boo() { return 239 }  }\n", { lineNumber: 0, columnNumber: 0 }))
+      .then(InspectorTest.logMessage)
+      .then(() => waitForPossibleBreakpoints("() => { 239 }\n", { lineNumber: 0, columnNumber: 0 }))
+      .then(InspectorTest.logMessage)
+      // TODO(kozyatinskiy): lineNumber for return position should be 21 instead of 22.
+      .then(() => waitForPossibleBreakpoints("function foo() { 239 }\n", { lineNumber: 0, columnNumber: 0 }))
+      .then(InspectorTest.logMessage)
+      // TODO(kozyatinskiy): lineNumber for return position should be only 9, not 8.
+      .then(() => waitForPossibleBreakpoints("() => 239", { lineNumber: 0, columnNumber: 0 }))
+      .then(InspectorTest.logMessage)
+      // TODO(kozyatinskiy): lineNumber for return position should be only 19, not 20.
+      .then(() => waitForPossibleBreakpoints("() => { return 239 }", { lineNumber: 0, columnNumber: 0 }))
+      .then(InspectorTest.logMessage)
+      .then(next)
   }
-
 ]);
 
 function compileScript(source, origin) {
   var promise = Protocol.Debugger.onceScriptParsed().then(message => message.params.scriptId);
   if (!origin) origin = { name: "", line_offset: 0, column_offset: 0 };
   compileAndRunWithOrigin(source, origin.name, origin.line_offset, origin.column_offset);
   return promise;
 }
 
 function waitForPossibleBreakpoints(source, start, end, origin) {
@@ skipping 23 matching lines @@
     InspectorTest.logMessage(message);
     return;
   }
   var id_data = message.result.breakpointId.split(":");
   if (parseInt(id_data[1]) !== message.result.actualLocation.lineNumber || parseInt(id_data[2]) !== message.result.actualLocation.columnNumber) {
     InspectorTest.log("FAIL: possible breakpoint was resolved in another location");
     InspectorTest.logMessage(message);
   }
   InspectorTest.logMessage(message);
 }