Layout tests: Enable fetching generated files from the build directory

content/shell/renderer/layout_test/blink_test_runner.cc

 // Copyright (c) 2012 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.
 
 #include "content/shell/renderer/layout_test/blink_test_runner.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <clocale>
@@ skipping 350 matching lines @@
 
 WebURL BlinkTestRunner::RewriteLayoutTestsURL(const std::string& utf8_url,
                                               bool is_wpt_mode) {
   if (is_wpt_mode) {
     WebURL rewritten_url = RewriteAbsolutePathInCsswgTest(utf8_url);
     if (!rewritten_url.isEmpty())
       return rewritten_url;
     return WebURL(GURL(utf8_url));
   }
 
+  const char kGenPrefix[] = "file:///gen/";
+  const int kGenPrefixLen = arraysize(kGenPrefix) - 1;
+
+  // Map "file:///gen/" to "file://<build directory>/gen/".
+  if (!utf8_url.compare(0, kGenPrefixLen, kGenPrefix, kGenPrefixLen)) {
+    base::FilePath gen_directory_path =
+        test_config_->build_directory.Append(FILE_PATH_LITERAL("gen/"));
+    std::string new_url = std::string("file://") +
+                          gen_directory_path.AsUTF8Unsafe() +
+                          utf8_url.substr(kGenPrefixLen);
+    return WebURL(GURL(new_url));
+  }
+
   const char kPrefix[] = "file:///tmp/LayoutTests/";
   const int kPrefixLen = arraysize(kPrefix) - 1;
 
   if (utf8_url.compare(0, kPrefixLen, kPrefix, kPrefixLen))
     return WebURL(GURL(utf8_url));
 
   base::FilePath replace_path =
       LayoutTestRenderThreadObserver::GetInstance()->webkit_source_dir()
           .Append(FILE_PATH_LITERAL("LayoutTests/"));
   std::string utf8_path = replace_path.AsUTF8Unsafe();
@@ skipping 654 matching lines @@
 void BlinkTestRunner::ReportLeakDetectionResult(
     const LeakDetectionResult& report) {
   Send(new ShellViewHostMsg_LeakDetectionDone(routing_id(), report));
 }
 
 void BlinkTestRunner::OnDestruct() {
   delete this;
 }
 
 }  // namespace content