Send an event to the page load metrics to track resource starting.

chrome/browser/page_load_metrics/page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
index f3fa5d03ba0a44dffa7c175406b0bab005279369..e3af3bab698940f9789cacbbca7e9329913b2df1 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
@@ -54,18 +54,30 @@ PageLoadExtraInfo PageLoadExtraInfo::CreateForTesting(
       page_load_metrics::PageLoadMetadata());
 }
 
-ExtraRequestInfo::ExtraRequestInfo(bool was_cached,
-                                   int64_t raw_body_bytes,
-                                   bool data_reduction_proxy_used,
-                                   int64_t original_network_content_length)
+ExtraRequestCompleteInfo::ExtraRequestCompleteInfo(
+    bool was_cached,
+    int64_t raw_body_bytes,
+    bool data_reduction_proxy_used,
+    int64_t original_network_content_length,
+    content::ResourceType found_type)
     : was_cached(was_cached),
       raw_body_bytes(raw_body_bytes),
       data_reduction_proxy_used(data_reduction_proxy_used),
-      original_network_content_length(original_network_content_length) {}
+      original_network_content_length(original_network_content_length),
+      resource_type(found_type) {}
 
-ExtraRequestInfo::ExtraRequestInfo(const ExtraRequestInfo& other) = default;
+ExtraRequestCompleteInfo::ExtraRequestCompleteInfo(
+    const ExtraRequestCompleteInfo& other) = default;
 
-ExtraRequestInfo::~ExtraRequestInfo() {}
+ExtraRequestCompleteInfo::~ExtraRequestCompleteInfo() {}
+
+ExtraRequestStartInfo::ExtraRequestStartInfo(content::ResourceType found_type)
+    : resource_type(found_type) {}
+
+ExtraRequestStartInfo::ExtraRequestStartInfo(
+    const ExtraRequestStartInfo& other) = default;
+
+ExtraRequestStartInfo::~ExtraRequestStartInfo() {}
 
 FailedProvisionalLoadInfo::FailedProvisionalLoadInfo(base::TimeDelta interval,
                                                      net::Error error)