Add RTCPeerConnection RAPPOR metrics.

third_party/WebKit/Source/modules/mediastream/RTCPeerConnection.cpp

Index: third_party/WebKit/Source/modules/mediastream/RTCPeerConnection.cpp
diff --git a/third_party/WebKit/Source/modules/mediastream/RTCPeerConnection.cpp b/third_party/WebKit/Source/modules/mediastream/RTCPeerConnection.cpp
index 1c63506d55dc2271ff042304b52afe6372f0c1d6..8833e93f3918c5bba84e86f3a0e7500fb5703841 100644
--- a/third_party/WebKit/Source/modules/mediastream/RTCPeerConnection.cpp
+++ b/third_party/WebKit/Source/modules/mediastream/RTCPeerConnection.cpp
@@ -46,6 +46,7 @@
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
+#include "core/frame/HostsUsingFeatures.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/VoidCallback.h"
@@ -395,6 +396,9 @@ DEFINE_TRACE(RTCPeerConnection::EventWrapper)
 
 RTCPeerConnection* RTCPeerConnection::create(ExecutionContext* context, const Dictionary& rtcConfiguration, const Dictionary& mediaConstraints, ExceptionState& exceptionState)
 {
+    Document* document = toDocument(context);
+    HostsUsingFeatures::countAnyWorld(*document, HostsUsingFeatures::Feature::RTCPeerConnectionCreated);
+
     if (mediaConstraints.isObject())
         UseCounter::count(context, UseCounter::RTCPeerConnectionConstructorConstraints);
     else
@@ -1157,6 +1161,10 @@ void RTCPeerConnection::changeSignalingState(SignalingState signalingState)
 {
     if (m_signalingState != SignalingStateClosed && m_signalingState != signalingState) {
         m_signalingState = signalingState;
+        if (m_signalingState == SignalingStateStable) {
+            Document* document = toDocument(getExecutionContext());
+            HostsUsingFeatures::countAnyWorld(*document, HostsUsingFeatures::Feature::RTCPeerConnectionStable);
+        }
         scheduleDispatchEvent(Event::create(EventTypeNames::signalingstatechange));
     }
 }
@@ -1170,6 +1178,10 @@ bool RTCPeerConnection::setIceConnectionState(ICEConnectionState iceConnectionSt
 {
     if (m_iceConnectionState != ICEConnectionStateClosed && m_iceConnectionState != iceConnectionState) {
         m_iceConnectionState = iceConnectionState;
+        if (m_iceConnectionState == ICEConnectionStateConnected) {
+            Document* document = toDocument(getExecutionContext());
+            HostsUsingFeatures::countAnyWorld(*document, HostsUsingFeatures::Feature::RTCPeerConnectionConnected);
+        }
         return true;
     }
     return false;