arc-bridge: Implement IPC message for app launcher

components/arc/common/arc_message_traits.h

Index: components/arc/common/arc_message_traits.h
diff --git a/components/arc/common/arc_message_traits.h b/components/arc/common/arc_message_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..9d0938ff917899742adc50297cd8c189c703b9e8
--- /dev/null
+++ b/components/arc/common/arc_message_traits.h
@@ -0,0 +1,17 @@
+// Copyright 2015 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 "components/arc/common/arc_message_types.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+
+IPC_ENUM_TRAITS_MIN_MAX_VALUE(arc::ScaleFactor,
+                              arc::ScaleFactor::SCALE_FACTOR_100P,

[yoshiki, 2015/12/03 02:24:32]

SCALE_FACTOR_NONE is never passed, right? SCALE_FACTOR_NONE is smaller than
SCALE_FACTOR_100P.

[khmel1, 2015/12/03 03:53:27]

Right, SCALE_FACTOR_NONE is invalid value for this IPC and it is yes, smaller
than 100P.

+                              arc::ScaleFactor::NUM_SCALE_FACTORS);

[yoshiki, 2015/12/03 02:24:32]

This is the max value, so you may specify "NUM_SCALE_FACTORS - 1"?

[khmel1, 2015/12/03 03:53:27]

Yes, you are right, they are both inclusive and I had wrong understanding. Will
fix in the next CL or at separate CL. 565065 is reported for this. Thanks for
attention!

+
+IPC_STRUCT_TRAITS_BEGIN(arc::AppInfo)
+  IPC_STRUCT_TRAITS_MEMBER(name)
+  IPC_STRUCT_TRAITS_MEMBER(package)
+  IPC_STRUCT_TRAITS_MEMBER(activity)
+IPC_STRUCT_TRAITS_END()