[DevTools] Show blocked requests in Network panel.

Source/platform/network/ResourceRequest.h

Index: Source/platform/network/ResourceRequest.h
diff --git a/Source/platform/network/ResourceRequest.h b/Source/platform/network/ResourceRequest.h
index 824ab21759c72adaa25c6ab6d627f6f719723fde..f3bf4094633510182c1a36c4afd33d7c2ea063ef 100644
--- a/Source/platform/network/ResourceRequest.h
+++ b/Source/platform/network/ResourceRequest.h
@@ -48,6 +48,15 @@ enum ResourceRequestCachePolicy {
     ReloadBypassingCache, // end-to-end reload
 };
 
+enum ResourceRequestBlockedReason {
+    ResourceRequestBlockedReasonCSP,
+    ResourceRequestBlockedReasonMixedContent,
+    ResourceRequestBlockedReasonOrigin,
+    ResourceRequestBlockedReasonInspector,
+    ResourceRequestBlockedReasonOther,
+    ResourceRequestBlockedReasonNone
+};
+
 enum InputToLoadPerfMetricReportPolicy {
     NoReport, // Don't report metrics for this ResourceRequest.
     ReportLink, // Report metrics for this request as initiated by a link click.