Run media_perftests in a single process.

masters/master.chromium.perf/master.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # 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.
 
 # This is the buildmaster config file for the 'chromium' bot. It must
 # be installed as 'master.cfg' in your buildmaster's base directory
 # (although the filename can be changed with the --basedir option to
@@ skipping 91 matching lines @@
 ]
 
 # These are GPU sensitive benchmarks that run on bots that vary only the GPU
 # hardware in addition to bots across all the platforms.
 _GPU_BENCHMARKS = [
     ( 3, 'cc_perftests'),
     ( 3, 'fast_path_key_mobile_sites'),
     ( 2, 'image_decoding_tough_decoding_cases'),
     (14, 'jsgamebench'),
     ( 5, 'maps'),
-    ( 1, 'media_perftests'),
+    ( 4, 'media_perftests'),
     ( 0, 'rasterize_and_record_key_silk_cases'),  # TODO: Estimate runtime.
     (18, 'rasterize_and_record_micro_top_25'),
     (18, 'rasterize_and_record_top_25'),
     ( 1, 'robohornet_pro'),
     ( 7, 'smoothness_top_25'),
     ( 7, 'smoothness_tough_canvas_cases'),
     (13, 'spaceport'),
 ]
 
 # These run only on Desktop because of various technical limitations.
@@ skipping 1084 matching lines @@
 
 ####### PROJECT IDENTITY
 
 # the 'projectName' string will be used to describe the project that this
 # buildbot is working on. For example, it is used as the title of the
 # waterfall HTML page. The 'projectURL' string will be used to provide a link
 # from buildbot HTML pages to your project's home page.
 
 c['projectName'] = ActiveMaster.project_name
 c['projectURL'] = config.Master.project_url