Mojo message validation tests: add integration tests and move existing conformance tests.

mojo/public/cpp/bindings/lib/router.cc

Index: mojo/public/cpp/bindings/lib/router.cc
diff --git a/mojo/public/cpp/bindings/lib/router.cc b/mojo/public/cpp/bindings/lib/router.cc
index 7d0d868a044f536728537f701e254b161ace4b0a..a2be32e9985e6370cde235caf369ad14e392ba4e 100644
--- a/mojo/public/cpp/bindings/lib/router.cc
+++ b/mojo/public/cpp/bindings/lib/router.cc
@@ -57,7 +57,8 @@ Router::Router(ScopedMessagePipeHandle message_pipe,
       connector_(message_pipe.Pass(), waiter),
       weak_self_(this),
       incoming_receiver_(NULL),
-      next_request_id_(0) {
+      next_request_id_(0),
+      testing_mode_(false) {
   filters_.SetSink(&thunk_);
   connector_.set_incoming_receiver(filters_.GetHead());
 }
@@ -94,6 +95,11 @@ bool Router::AcceptWithResponder(Message* message,
   return true;
 }
 
+void Router::EnableTestingMode() {
+  testing_mode_ = true;
+  connector_.set_enforce_errors_from_incoming_receiver(false);
+}
+
 bool Router::HandleIncomingMessage(Message* message) {
   if (message->has_flag(kMessageExpectsResponse)) {
     if (incoming_receiver_) {
@@ -111,7 +117,7 @@ bool Router::HandleIncomingMessage(Message* message) {
     uint64_t request_id = message->request_id();
     ResponderMap::iterator it = responders_.find(request_id);
     if (it == responders_.end()) {
-      assert(false);
+      assert(testing_mode_);
       return false;
     }
     MessageReceiver* responder = it->second;