Blimp: Add BlobChannel Helium messages and delegate impls.

blimp/common/create_blimp_message_unittest.cc

Index: blimp/common/create_blimp_message_unittest.cc
diff --git a/blimp/common/create_blimp_message_unittest.cc b/blimp/common/create_blimp_message_unittest.cc
index d2b57dc5488ad63b68cb4830e1867dd8735a1174..a6af042aa9ecb471c3868c7802e2e257550425e2 100644
--- a/blimp/common/create_blimp_message_unittest.cc
+++ b/blimp/common/create_blimp_message_unittest.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/memory/ptr_util.h"
 #include "blimp/common/create_blimp_message.h"
 #include "blimp/common/proto/blimp_message.pb.h"
 #include "blimp/common/proto/compositor.pb.h"
@@ -91,5 +92,13 @@ TEST(CreateBlimpMessageTest, StartConnectionMessage) {
             message->protocol_control().start_connection().protocol_version());
 }
 
+TEST(CreateBlimpMessageTest, BlobChannelMessage) {
+  BlobChannelMessage* details;
+  std::unique_ptr<BlimpMessage> message = CreateBlimpMessage(&details);
+  ASSERT_TRUE(message);
+  EXPECT_EQ(details, &message->blob_channel());
+  EXPECT_EQ(BlimpMessage::BLOB_CHANNEL, message->type());
+}
+
 }  // namespace
 }  // namespace blimp