[Telemetry] Add a profiler based loading measurement.

tools/telemetry/telemetry/core/platform/profiler/perf_profiler_unittest.py

Index: tools/telemetry/telemetry/core/platform/profiler/perf_profiler_unittest.py
diff --git a/tools/telemetry/telemetry/core/platform/profiler/perf_profiler_unittest.py b/tools/telemetry/telemetry/core/platform/profiler/perf_profiler_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..cd2b9a88ee418b5deb60165c404d17704b043bdc
--- /dev/null
+++ b/tools/telemetry/telemetry/core/platform/profiler/perf_profiler_unittest.py
@@ -0,0 +1,31 @@
+# Copyright (c) 2013 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.
+import os
+import logging
+import unittest
+
+from telemetry.core.platform.profiler import perf_profiler
+from telemetry.unittest import options_for_unittests
+
+class TestPerfProfiler(unittest.TestCase):
+  def testPerfProfiler(self):
+    options = options_for_unittests.GetCopy()
+    if not perf_profiler.PerfProfiler.is_supported(options):
+      logging.warning('PerfProfiler is not supported. Skipping test')
+      return
+
+    profile_file = os.path.join(os.path.dirname(__file__),
+                                'testdata', 'perf.profile')
+    self.assertEqual(perf_profiler.PerfProfiler.GetTopSamples(profile_file, 10),
+        { 'v8::internal::StaticMarkingVisitor::MarkMapContents': 63615201,
+          'v8::internal::RelocIterator::next': 38271931,
+          'v8::internal::LAllocator::MeetConstraintsBetween': 42913933,
+          'v8::internal::FlexibleBodyVisitor::Visit': 31909537,
+          'v8::internal::LiveRange::CreateAssignedOperand': 42913933,
+          'void v8::internal::RelocInfo::Visit': 96878864,
+          'WebCore::HTMLTokenizer::nextToken': 48240439,
+          'v8::internal::Scanner::ScanIdentifierOrKeyword': 46054550,
+          'sk_memset32_SSE2': 45121317,
+          'v8::internal::HeapObject::Size': 39786862
+          })