Add FMP to DataReductionProxy UMA and to Pingback Metrics

components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.cc
index 93178372cbbac724254e8eca305f993110a23d6a..0613ac667123913312da9a96c51f91f783d3c5f6 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.cc
@@ -41,20 +41,26 @@ void AddDataToPageloadMetrics(const DataReductionProxyData& request_data,
       protobuf_parser::CreateTimestampFromTime(timing.navigation_start)
           .release());
   if (request_data.request_url().is_valid())
     request->set_first_request_url(request_data.request_url().spec());
   if (timing.first_contentful_paint) {
     request->set_allocated_time_to_first_contentful_paint(
         protobuf_parser::CreateDurationFromTimeDelta(
             timing.first_contentful_paint.value())
             .release());
   }
+  if (timing.experimental_first_meaningful_paint) {
+    request->set_allocated_experimental_time_to_first_meaningful_paint(
+        protobuf_parser::CreateDurationFromTimeDelta(
+            timing.experimental_first_meaningful_paint.value())
+            .release());
+  }
   if (timing.first_image_paint) {
     request->set_allocated_time_to_first_image_paint(
         protobuf_parser::CreateDurationFromTimeDelta(
             timing.first_image_paint.value())
             .release());
   }
   if (timing.response_start) {
     request->set_allocated_time_to_first_byte(
         protobuf_parser::CreateDurationFromTimeDelta(
             timing.response_start.value())