Move blink_perf.xml_http_request benchmark to tools/perf/contrib/ directory

tools/perf/core/benchmark_finders.py

Index: tools/perf/core/benchmark_finders.py
diff --git a/tools/perf/core/benchmark_finders.py b/tools/perf/core/benchmark_finders.py
index 6705b16cb537e547f02baec107b2329be9ad9917..4cb79e6651e8f2f633316d7af342359d4dee133d 100644
--- a/tools/perf/core/benchmark_finders.py
+++ b/tools/perf/core/benchmark_finders.py
@@ -44,8 +44,16 @@ def GetBenchmarkNamesForFile(top_level_dir, benchmark_file_dir):
 
 
 def GetAllPerfBenchmarks():
-  benchmarks_dir = path_util.GetPerfBenchmarksDir()
-  top_level_dir = os.path.join(benchmarks_dir, '..')
   return discover.DiscoverClasses(
-      benchmarks_dir, top_level_dir, benchmark_module.Benchmark,
+      start_dir=path_util.GetPerfBenchmarksDir(),
+      top_level_dir=path_util.GetPerfDir(),
+      base_class=benchmark_module.Benchmark,
+      index_by_class_name=True).values()
+
+
+def GetAllContribBenchmarks():
+  return discover.DiscoverClasses(
+      start_dir=path_util.GetPerfContribDir(),
+      top_level_dir=path_util.GetPerfDir(),
+      base_class=benchmark_module.Benchmark,
       index_by_class_name=True).values()