Introduce Java 8 bytecode bridge for instrumentation API

dd-java-agent/agent-bootstrap/src/main/java/datadog/trace/bootstrap/instrumentation/api/Java8BytecodeBridge.java

@@ -0,0 +1,32 @@
+package datadog.trace.bootstrap.instrumentation.api;
+
+import datadog.context.Context;
+
+/**
+ * A helper for accessing methods that rely on new Java 8 bytecode features such as calling a static
+ * interface methods. In instrumentation, we may need to call these methods in code that is inlined
+ * into an instrumented class, however many times the instrumented class has been compiled to a
+ * previous version of bytecode, and so we cannot inline calls to static interface methods, as those
+ * were not supported prior to Java 8 and will lead to a class verification error.
+ */
+public class Java8BytecodeBridge {
+  /** @see Context#root() */
+  public static Context getRootContext() {
+    return Context.root();
+  }
+
+  /** @see Context#current() */
+  public static Context getCurrentContext() {
+    return Context.current();
+  }
+
+  /** @see Context#from(Object) */
+  public static Context getContextFrom(Object carrier) {
+    return Context.from(carrier);
+  }
+
+  /** @see Context#detachFrom(Object) */
+  public static Context detachContextFrom(Object carrier) {
+    return Context.detachFrom(carrier);
+  }
+}