RTCCertificate equals method for testing.

third_party/WebKit/public/platform/WebRTCCertificate.h

Index: third_party/WebKit/public/platform/WebRTCCertificate.h
diff --git a/third_party/WebKit/public/platform/WebRTCCertificate.h b/third_party/WebKit/public/platform/WebRTCCertificate.h
index 809839266a611882b6fed88293bb59a7d6e43ba6..c9b7a7584144d4d45bacf1992017d16006a339d2 100644
--- a/third_party/WebKit/public/platform/WebRTCCertificate.h
+++ b/third_party/WebKit/public/platform/WebRTCCertificate.h
@@ -31,6 +31,10 @@ public:
     // Returns the expiration time in ms relative to epoch, 1970-01-01T00:00:00Z.
     virtual uint64_t expires() const = 0;
 
+    // Checks if the two certificate objects represent the same certificate value,
+    // as should be the case for a clone and the original.
+    virtual bool equals(const WebRTCCertificate& other) const = 0;
+
 private:
     WebRTCCertificate(const WebRTCCertificate&) = delete;
     WebRTCCertificate& operator=(const WebRTCCertificate&) = delete;