Add Settings[, Oberser] java code and JNI bridge.

blimp/client/core/context/blimp_client_context_impl.h

Index: blimp/client/core/context/blimp_client_context_impl.h
diff --git a/blimp/client/core/context/blimp_client_context_impl.h b/blimp/client/core/context/blimp_client_context_impl.h
index 55135eae8976697014072d50796b9b816b5676e9..6d4527233929bd4862c29534a558df593c57c928 100644
--- a/blimp/client/core/context/blimp_client_context_impl.h
+++ b/blimp/client/core/context/blimp_client_context_impl.h
@@ -78,6 +78,8 @@ class BlimpClientContextImpl
   IdentitySource* GetIdentitySource() override;
   ConnectionStatus* GetConnectionStatus() override;
 
+  Settings* settings() { return settings_.get(); }
+
  private:
   // Called when the AssignmentSource is finished getting an Assignment.  Will
   // then call |ConnectWithAssignment| to initiate the actual connection.