Add UMA to count the usage of sendBeacon with non-simple Content-Type

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 837230d02d7bf9212391ac3085a78d11ddfd15c5..6c23bd3897113a6a838265c38e26a7faf20c41e5 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -252,6 +252,10 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   WebRuntimeFeatures::enableRenderingPipelineThrottling(
     base::FeatureList::IsEnabled(features::kRenderingPipelineThrottling));
 
+  if (base::FeatureList::IsEnabled(
+          features::kSendBeaconThrowForBlobWithNonSimpleType))
+    WebRuntimeFeatures::enableSendBeaconThrowForBlobWithNonSimpleType(true);
+
 #if defined(OS_ANDROID)
   WebRuntimeFeatures::enablePaymentRequest(
       base::FeatureList::IsEnabled(features::kWebPayments));