Add frame-specific InterfaceProviderSpec.

services/service_manager/public/cpp/lib/interface_provider_spec.cc

Index: services/service_manager/public/cpp/lib/interface_provider_spec.cc
diff --git a/services/service_manager/public/cpp/lib/interface_provider_spec.cc b/services/service_manager/public/cpp/lib/interface_provider_spec.cc
index 0fe73acf20b25780cc104e61b33e55967fd7d097..e83af51139ba7c29da0c7f1bc381c9f157d8eb82 100644
--- a/services/service_manager/public/cpp/lib/interface_provider_spec.cc
+++ b/services/service_manager/public/cpp/lib/interface_provider_spec.cc
@@ -6,6 +6,8 @@
 
 #include <tuple>
 
+#include "base/logging.h"
+
 namespace service_manager {
 
 InterfaceProviderSpec::InterfaceProviderSpec() {}
@@ -24,4 +26,16 @@ bool InterfaceProviderSpec::operator<(
       std::tie(other.provides, other.requires);
 }
 
+bool GetInterfaceProviderSpec(const std::string& spec_name,
+                              const InterfaceProviderSpecMap& map,
+                              InterfaceProviderSpec* spec) {
+  DCHECK(spec);
+  auto it = map.find(spec_name);
+  if (it != map.end()) {
+    *spec = it->second;
+    return true;
+  }
+  return false;
+}
+
 }  // namespace service_manager