Implemented telemetry benchmark that loads page and outputs screenshot.

tools/perf/contrib/cluster_telemetry/screenshot_ct.py

Index: tools/perf/contrib/cluster_telemetry/screenshot_ct.py
diff --git a/tools/perf/contrib/cluster_telemetry/screenshot_ct.py b/tools/perf/contrib/cluster_telemetry/screenshot_ct.py
new file mode 100644
index 0000000000000000000000000000000000000000..329a3d8ccfe1bf82956e268020b1994005d6ae1a
--- /dev/null
+++ b/tools/perf/contrib/cluster_telemetry/screenshot_ct.py
@@ -0,0 +1,42 @@
+# Copyright 2017 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.
+
+from core import perf_benchmark
+
+from contrib.cluster_telemetry import ct_benchmarks_util
+from contrib.cluster_telemetry import page_set
+from contrib.cluster_telemetry import repaint_helpers
+from contrib.cluster_telemetry import screenshot
+
+class ScreenshotCT(perf_benchmark.PerfBenchmark):
+  """Captures PNG screenshots of web pages for Cluster Telemetry. Screenshots
+     written to local file with path-safe urls of pages as filenames. Cluster
+     Telemetry is then used for aggregation and analysis."""
+
+  @classmethod
+  def Name(cls):
+    return 'screenshot_ct'
+
+  @classmethod
+  def AddBenchmarkCommandLineArgs(cls, parser):
+    ct_benchmarks_util.AddBenchmarkCommandLineArgs(parser)
+    parser.add_option('--png-outdir', type='string',
+                      default=None,
+                      help='Output directory for the PNG files')
+    parser.add_option('--wait-time', type='float', default=0,
+                      help='Wait time before the benchmark is started')
+
+  @classmethod
+  def ProcessCommandLineArgs(cls, parser, args):
+    ct_benchmarks_util.ValidateCommandLineArgs(parser, args)
+    if not args.png_outdir:
+      parser.error('Please specify --png-outdir')
+
+  def CreatePageTest(self, options):
+    return screenshot.Screenshot(options.png_outdir)
+
+  def CreateStorySet(self, options):
+    return page_set.CTPageSet(
+        options.urls_list, options.user_agent, options.archive_data_file,
+        run_page_interaction_callback=repaint_helpers.WaitThenRepaint)