smoothness.scrolling_tough_ad_cases to use browser driven scrolls

tools/telemetry/telemetry/internal/browser/browser_info.py

Index: tools/telemetry/telemetry/internal/browser/browser_info.py
diff --git a/tools/telemetry/telemetry/internal/browser/browser_info.py b/tools/telemetry/telemetry/internal/browser/browser_info.py
index a77fec386d25aea87ac646c6bc46fac12d1e9570..5db71505d2ca019a7cd787d435fc6b087a9b9171 100644
--- a/tools/telemetry/telemetry/internal/browser/browser_info.py
+++ b/tools/telemetry/telemetry/internal/browser/browser_info.py
@@ -54,6 +54,13 @@ class BrowserInfo(object):
         self._browser._browser_backend.devtools_client.GetChromeBranchNumber())
     return branch_num >= 2332
 
+  def HasRepeatableSynthesizeScrollGesture(self):
+    # Repeatable SynthesizeScrollGesture scrolling was not supported until
+    # Chromium branch number 2480
+    branch_num = (
+        self._browser._browser_backend.devtools_client.GetChromeBranchNumber())
+    return branch_num >= 2480
+
   @property
   def browser_type(self):
     return self._browser.browser_type