DevTools: add custom-devtools-frontend flag for content shell layout tests

third_party/WebKit/Source/devtools/scripts/npm_test.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var childProcess = require("child_process");
 var fs = require("fs");
 var path = require("path");
 var shell = require("child_process").execSync;
 
 var utils = require("./utils");
@@ skipping 192 matching lines @@
     var contentShellResourcesPath = path.resolve(buildDirectoryPath, "Release", "resources");
     build(contentShellResourcesPath);
     if (IS_BUILD_ONLY)
         return;
     runTests(buildDirectoryPath);
 }
 
 function build(contentShellResourcesPath)
 {
     var devtoolsResourcesPath = path.resolve(contentShellResourcesPath, "inspector");
-    var copiedFrontendPath = path.resolve(devtoolsResourcesPath, "front_end");
-    var debugPath = path.resolve(devtoolsResourcesPath, "debug");
-    utils.removeRecursive(copiedFrontendPath);
-    utils.removeRecursive(debugPath);
-    utils.copyRecursive(SOURCE_PATH, devtoolsResourcesPath);
-    fs.renameSync(copiedFrontendPath, debugPath);
     var inspectorBackendCommandsPath = path.resolve(devtoolsResourcesPath, "InspectorBackendCommands.js");
     var supportedCSSPropertiesPath = path.resolve(devtoolsResourcesPath, "SupportedCSSProperties.js");
-    utils.copy(inspectorBackendCommandsPath, debugPath);
-    utils.copy(supportedCSSPropertiesPath, debugPath);
+    utils.copy(inspectorBackendCommandsPath, SOURCE_PATH);
+    utils.copy(supportedCSSPropertiesPath, SOURCE_PATH);
 }
 
 function runTests(buildDirectoryPath)
 {
     var testArgs = [
+        `--additional-drt-flag=--devtools-path=${SOURCE_PATH}`,
         "--additional-drt-flag=--debug-devtools",
         "--no-pixel-tests",
         "--build-directory",
         buildDirectoryPath,
     ].concat(getInspectorTests());
     if (IS_DEBUG_ENABLED) {
         testArgs.push("--additional-drt-flag=--remote-debugging-port=9222");
         testArgs.push("--time-out-ms=6000000");
         console.log("\n=============================================");
         console.log("Go to: http://localhost:9222/");
@@ skipping 16 matching lines @@
 function getInspectorTests()
 {
     var specificTests = process.argv.filter(arg => utils.includes(arg, "inspector"));
     if (specificTests.length)
         return specificTests;
     return [
         "inspector*",
         "http/tests/inspector*",
     ];
 }