Pass DecryptConfig parameters over IPC and use it in AVDA.

media/base/decrypt_config.cc

Index: media/base/decrypt_config.cc
diff --git a/media/base/decrypt_config.cc b/media/base/decrypt_config.cc
index 7df9216ed98975b9525282994b6aa9c030689249..c15ac73718bc7f70e6f42b57462fac3645309050 100644
--- a/media/base/decrypt_config.cc
+++ b/media/base/decrypt_config.cc
@@ -5,6 +5,7 @@
 #include "media/base/decrypt_config.h"
 
 #include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
 
 namespace media {
 
@@ -37,4 +38,17 @@ bool DecryptConfig::Matches(const DecryptConfig& config) const {
   return true;
 }
 
+std::ostream& DecryptConfig::Print(std::ostream& os) const {
+  os << "key_id:'" << base::HexEncode(key_id_.data(), key_id_.size()) << "'"
+     << " iv:'" << base::HexEncode(iv_.data(), iv_.size()) << "'";
+
+  os << " subsamples:[";
+  for (const SubsampleEntry& entry : subsamples_) {
+    os << "(clear:" << entry.clear_bytes << ", cypher:" << entry.cypher_bytes
+       << ")";
+  }
+  os << "]";
+  return os;
+}
+
 }  // namespace media