Blimp: create MessageDispatcher class.

blimp/common/BUILD.gn

Index: blimp/common/BUILD.gn
diff --git a/blimp/common/BUILD.gn b/blimp/common/BUILD.gn
index a9dfd35bf8faac1759d30e01711cce54f7a45c17..cb90f9d93d90ac35d51c0914189ad0086d44f83d 100644
--- a/blimp/common/BUILD.gn
+++ b/blimp/common/BUILD.gn
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//testing/test.gni")
+
 component("blimp_common") {
   sources = [
     # TODO(dtrainor): Remove this once the LayerTreeHost settings for Blimp
@@ -11,6 +13,8 @@ component("blimp_common") {
     "blimp_common_export.h",
     "compositor/blimp_layer_tree_settings.cc",
     "compositor/blimp_layer_tree_settings.h",
+    "net/message_dispatcher.cc",
+    "net/message_dispatcher.h",
   ]
 
   defines = [ "BLIMP_COMMON_IMPLEMENTATION=1" ]
@@ -25,3 +29,17 @@ component("blimp_common") {
     "//ui/native_theme",
   ]
 }
+
+test("blimp_common_unit_tests") {
+  deps = [
+    ":blimp_common",
+    "//base",
+    "//base/test:test_support",
+    "//base/test:run_all_unittests",
+    "//blimp/common/proto",
+    "//testing/gmock",
+  ]
+  sources = [
+    "net/message_dispatcher_unittest.cc",
+  ]
+}