Orderfile: turn on system health order profiling.

This sets default orderfile generation to use system health profiling.

Bug: 758566
Change-Id: Ie87f8b2623373861c7bdc44d5dfd866ce3597cd9
Reviewed-on: https://chromium-review.googlesource.com/1228074
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Reviewed-by: Egor Pasko <pasko@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591674}

tools/cygprofile/orderfile_generator_backend.py

@@ -812,10 +812,11 @@ def CreateArgumentParser():
       '--use-goma', action='store_true', help='Enable GOMA.', default=False)
   parser.add_argument('--adb-path', help='Path to the adb binary.')
 
-  parser.add_argument('--system-health-orderfile', action='store_true',
-                      help=('Create an orderfile based on system health '
-                            'benchmarks.'),
-                      default=False)
+  parser.add_argument('--nosystem-health-orderfile', action='store_false',
+                      dest='system_health_orderfile', default=True,
+                      help=('Create an orderfile based on an about:blank '
+                            'startup benchmark instead of system health '
+                            'benchmarks.'))
   parser.add_argument('--monochrome', action='store_true',
                       help=('Compile and instrument monochrome (for post-N '
                             'devices).'))