RTCCertificateGeneratorInterface and RTCCertificateGeneratorStoreWrapper added.

webrtc/base/rtccertificategenerator.h

Index: webrtc/base/rtccertificategenerator.h
diff --git a/webrtc/base/rtccertificategenerator.h b/webrtc/base/rtccertificategenerator.h
index 08fe67108d4b9b4be180f67094fd744ab314c125..c131d695fdb60cb459c38ca0cb6053df362be8c2 100644
--- a/webrtc/base/rtccertificategenerator.h
+++ b/webrtc/base/rtccertificategenerator.h
@@ -20,6 +20,7 @@
 
 namespace rtc {
 
+// See |RTCCertificateGeneratorInterface::GenerateCertificateAsync|.
 class RTCCertificateGeneratorCallback : public RefCountInterface {
  public:
   virtual void OnSuccess(
@@ -31,10 +32,27 @@ class RTCCertificateGeneratorCallback : public RefCountInterface {
 };
 
 // Generates |RTCCertificate|s.
+// See |RTCCertificateGenerator| for the WebRTC repo's implementation.
+class RTCCertificateGeneratorInterface {
+ public:
+  virtual ~RTCCertificateGeneratorInterface() {}
+
+  // Generates a certificate asynchronously on the worker thread.
+  // Must be called on the signaling thread. The |callback| is invoked with the
+  // result on the signaling thread. |exipres_ms| optionally specifies for how
+  // long we want the certificate to be valid, but the implementation may choose
+  // its own restrictions on the expiration time.
+  virtual void GenerateCertificateAsync(
+      const KeyParams& key_params,
+      const Optional<uint64_t>& expires_ms,
+      const scoped_refptr<RTCCertificateGeneratorCallback>& callback) = 0;
+};
+
+// Standard implementation of |RTCCertificateGeneratorInterface|.
 // The static function |GenerateCertificate| generates a certificate on the
 // current thread. The |RTCCertificateGenerator| instance generates certificates
 // asynchronously on the worker thread with |GenerateCertificateAsync|.
-class RTCCertificateGenerator {
+class RTCCertificateGenerator : public RTCCertificateGeneratorInterface {
  public:
   // Generates a certificate on the current thread. Returns null on failure.
   // If |expires_ms| is specified, the certificate will expire in approximately
@@ -46,18 +64,17 @@ class RTCCertificateGenerator {
       const Optional<uint64_t>& expires_ms);
 
   RTCCertificateGenerator(Thread* signaling_thread, Thread* worker_thread);
+  ~RTCCertificateGenerator() override {}
 
-  // Generates a certificate asynchronously on the worker thread.
-  // Must be called on the signaling thread. The |callback| is invoked with the
-  // result on the signaling thread. If |expires_ms| is specified, the
-  // certificate will expire in approximately that many milliseconds from now.
-  // |expires_ms| is limited to a year, a larger value than that is clamped down
-  // to a year. If |expires_ms| is not  specified, a default expiration time is
-  // used.
+  // |RTCCertificateGeneratorInterface| overrides.
+  // If |expires_ms| is specified, the certificate will expire in approximately
+  // that many milliseconds from now. |expires_ms| is limited to a year, a
+  // larger value than that is clamped down to a year. If |expires_ms| is not
+  // specified, a default expiration time is used.
   void GenerateCertificateAsync(
       const KeyParams& key_params,
       const Optional<uint64_t>& expires_ms,
-      const scoped_refptr<RTCCertificateGeneratorCallback>& callback);
+      const scoped_refptr<RTCCertificateGeneratorCallback>& callback) override;
 
  private:
   Thread* const signaling_thread_;