BrowserOptions.extra_browser_args is now a set.

tools/perf/measurements/skpicture_printer.py

Index: tools/perf/measurements/skpicture_printer.py
diff --git a/tools/perf/measurements/skpicture_printer.py b/tools/perf/measurements/skpicture_printer.py
index 5a74453e399fc3e0c10faf8fa6717d09d33b17ba..62d388e96b259a6f31451a9a794446e928c20d71 100644
--- a/tools/perf/measurements/skpicture_printer.py
+++ b/tools/perf/measurements/skpicture_printer.py
@@ -15,10 +15,10 @@ class SkpicturePrinter(page_measurement.PageMeasurement):
                       help='Output directory for the SKP files')
 
   def CustomizeBrowserOptions(self, options):
-    options.extra_browser_args.extend(['--enable-gpu-benchmarking',
-                                       '--no-sandbox',
-                                       '--enable-deferred-image-decoding',
-                                       '--force-compositing-mode'])
+    options.AppendExtraBrowserArgs(['--enable-gpu-benchmarking',
+                                    '--no-sandbox',
+                                    '--enable-deferred-image-decoding',
+                                    '--force-compositing-mode'])
 
   def MeasurePage(self, page, tab, results):
     skp_outdir = self.options.skp_outdir