Add support for parallel runs

ct/isolates/chromium_perf.isolate

Index: ct/isolates/chromium_perf.isolate
diff --git a/ct/isolates/chromium_analysis.isolate b/ct/isolates/chromium_perf.isolate
similarity index 53%
copy from ct/isolates/chromium_analysis.isolate
copy to ct/isolates/chromium_perf.isolate
index 7fc424a8801288a58a46f6de0548dbc2074f9443..0f881168b9495b870be3e1c40e96728a26ced478 100644
--- a/ct/isolates/chromium_analysis.isolate
+++ b/ct/isolates/chromium_perf.isolate
@@ -9,19 +9,24 @@
     ['OS=="linux"', {
       'variables': {
         'files': [
-          '../../../../../bin/run_chromium_analysis',
+          '../../../../../bin/run_chromium_perf',
         ],
         'command': [
-          '../../../../../bin/run_chromium_analysis',
+          '../../../../../bin/run_chromium_perf',
           '-logtostderr',
           '--start_range=<(START_RANGE)',
           '--num=<(NUM)',
           '--pageset_type=<(PAGESET_TYPE)',
-          '--chromium_build=<(CHROMIUM_BUILD)',
+          '--chromium_build_nopatch=<(CHROMIUM_BUILD_NOPATCH)',
+          '--chromium_build_withpatch=<(CHROMIUM_BUILD_WITHPATCH)',
           '--run_id=<(RUN_ID)',
           '--benchmark_name=<(BENCHMARK)',
           '--benchmark_extra_args=<(BENCHMARK_ARGS)',
-          '--browser_extra_args=<(BROWSER_EXTRA_ARGS)',
+          '--browser_extra_args_nopatch=<(BROWSER_EXTRA_ARGS_NOPATCH)',
+          '--browser_extra_args_withpatch=<(BROWSER_EXTRA_ARGS_WITHPATCH)',
+          '--repeat_benchmark=<(REPEAT_BENCHMARK)',
+          '--run_in_parallel=<(RUN_IN_PARALLEL)',
+          '--target_platform=<(TARGET_PLATFORM)',
         ],
       },
     }],