Add metrics to measure localhost resources in non-secure contexts.

third_party/WebKit/Source/core/frame/UseCounter.h

Index: third_party/WebKit/Source/core/frame/UseCounter.h
diff --git a/third_party/WebKit/Source/core/frame/UseCounter.h b/third_party/WebKit/Source/core/frame/UseCounter.h
index 351a1b3b99183de5ce924392b73da52f8096a95e..8c7c5fadc571e9746d5d24cdd300d91a9cb3e8ff 100644
--- a/third_party/WebKit/Source/core/frame/UseCounter.h
+++ b/third_party/WebKit/Source/core/frame/UseCounter.h
@@ -1373,6 +1373,8 @@ class CORE_EXPORT UseCounter {
     RTCPeerConnectionCreateDataChannelMaxRetransmits = 1649,
     AudioContextCreateConstantSource = 1650,
     WebAudioConstantSourceNode = 1651,
+    LoopbackEmbeddedInSecureContext = 1652,
+    LoopbackEmbeddedInNonSecureContext = 1653,
 
     // Add new features immediately above this line. Don't change assigned
     // numbers of any item, and don't reuse removed slots.