Implement classes used for manipulating D-Bus messages.

Message/MethodCall/Response classes wrap around DBusMessage.

MessageReader and Message Writer provide API to read and write
D-Bus messages in a type safe fashion.

BUG=90036
TEST=The code is not yet used in Chrome. Run unit tests.


Review URL: http://codereview.chromium.org/7492029

git-svn-id: http://src.chromium.org/svn/trunk/src/build@94845 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -79,6 +79,7 @@
           'dependencies': [
             '../breakpad/breakpad.gyp:*',
             '../courgette/courgette.gyp:*',
+            '../dbus/dbus.gyp:*',
             '../sandbox/sandbox.gyp:*',
             '../cloud_print/virtual_driver/virtual_driver_linux.gyp:*',
           ],