[telemetry] Add support for BenchmarkResults that vary from page to page

tools/telemetry/telemetry/block_page_benchmark_results_unittest.py

Index: tools/telemetry/telemetry/block_page_benchmark_results_unittest.py
diff --git a/tools/telemetry/telemetry/block_page_benchmark_results_unittest.py b/tools/telemetry/telemetry/block_page_benchmark_results_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..ba4c02e5a8a99392bcfe5ae163db9cc0d680b756
--- /dev/null
+++ b/tools/telemetry/telemetry/block_page_benchmark_results_unittest.py
@@ -0,0 +1,63 @@
+# 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.
+import StringIO
+import os
+import unittest
+
+from telemetry import block_page_benchmark_results
+from telemetry.page_set import PageSet
+
+BlockPageBenchmarkResults = \
+    block_page_benchmark_results.BlockPageBenchmarkResults
+
+def _MakePageSet():
+  return PageSet.FromDict({
+      "description": "hello",
+      "archive_path": "foo.wpr",
+      "pages": [
+        {"url": "http://www.foo.com/"},
+        {"url": "http://www.bar.com/"}
+        ]
+      }, os.path.dirname(__file__))
+
+class NonPrintingBlockPageBenchmarkResults(BlockPageBenchmarkResults):
+  def __init__(self, *args):
+    super(NonPrintingBlockPageBenchmarkResults, self).__init__(*args)
+
+  def _PrintPerfResult(self, *args):
+    pass
+
+class BlockPageBenchmarkResultsTest(unittest.TestCase):
+  def setUp(self):
+    self._output = StringIO.StringIO()
+    self._page_set = _MakePageSet()
+
+  @property
+  def lines(self):
+    lines = StringIO.StringIO(self._output.getvalue()).readlines()
+    return [line.strip() for line in lines]
+
+  @property
+  def data(self):
+    return [line.split(': ', 1) for line in self.lines]
+
+  def test_with_output_after_every_page(self):
+    results = NonPrintingBlockPageBenchmarkResults(self._output)
+    results.WillMeasurePage(self._page_set[0])
+    results.Add('foo', 'seconds', 3)
+    results.DidMeasurePage()
+
+    results.WillMeasurePage(self._page_set[1])
+    results.Add('bar', 'seconds', 4)
+    results.DidMeasurePage()
+
+    expected = [
+      ['url', 'http://www.foo.com/'],
+      ['foo (seconds)', '3'],
+      [''],
+      ['url', 'http://www.bar.com/'],
+      ['bar (seconds)', '4'],
+      ['']
+    ]
+    self.assertEquals(self.data, expected)