Add support for enums within structs and interfaces to mojom.

mojo/public/bindings/sample/sample_service_unittests.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdio.h>
 #include <string.h>
 
 #include <algorithm>
 #include <string>
 
@@ skipping 191 matching lines @@
 
     if (i % 2 == 1)
       printf(" ");
     if (i % 8 == 7)
       printf(" ");
   }
 }
 
 class ServiceImpl : public ServiceStub {
  public:
-  virtual void Frobinate(const Foo& foo, bool baz,
+  virtual void Frobinate(const Foo& foo, int32_t baz,

[DaveMoore, 2013/12/20 02:53:18]

Nit: I think there was a reason that we decided not to strongly type the enum
uses in parameters but it seems like it would be better.

                          mojo::ScopedMessagePipeHandle port)
       MOJO_OVERRIDE {
     // Users code goes here to handle the incoming Frobinate message.
 
     // We mainly check that we're given the expected arguments.
     CheckFoo(foo);
-    EXPECT_TRUE(baz);
+    EXPECT_EQ(BAZ_EXTRA, baz);
 
     // Also dump the Foo structure and all of its members.
     // TODO(vtl): Make it optional, so that the test spews less?
     printf("Frobinate:\n");
     int depth = 1;
     Print(depth, "foo", foo);
     Print(depth, "baz", baz);
     Print(depth, "port", port.get());
   }
 };
@@ skipping 31 matching lines @@
   // allocated.
 
   mojo::AllocationScope scope;
 
   Foo foo = MakeFoo();
   CheckFoo(foo);
 
   mojo::ScopedMessagePipeHandle port0, port1;
   mojo::CreateMessagePipe(&port0, &port1);
 
-  service->Frobinate(foo, true, port0.Pass());
+  service->Frobinate(foo, Service::BAZ_EXTRA, port0.Pass());
 }
 
 }  // namespace sample