Decrease the default gamepad polling interval

Changes the default internal polling interval for gamepad state from
16 ms (~60 Hz) to 4 ms (~250 Hz).

BUG=855188

Change-Id: I4b791c27330b56519a7484c423ec764a00320e01
Reviewed-on: https://chromium-review.googlesource.com/1191234Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586395}

device/gamepad/public/cpp/gamepad_features.cc

@@ -60,7 +60,8 @@ bool AreGamepadButtonAxisEventsEnabled() {
 }
 
 size_t GetGamepadPollingInterval() {
-  size_t polling_interval = kPollingIntervalMillisecondsMax;
+  // Default to the minimum polling interval.
+  size_t polling_interval = kPollingIntervalMillisecondsMin;
 
   // Check if the polling interval is overridden by a field trial.
   if (base::FeatureList::IsEnabled(kGamepadPollingInterval)) {