shill: wimax: Implement WiMAX Manager and Device proxies.

Also, add a WiMax logging scope.

BUG=chrome-os-partner:9697
TEST=build and run unit tests

Change-Id: I8516ff2b55e54feb5fcdab089d0fe279551b4317
Reviewed-on: https://gerrit.chromium.org/gerrit/22695
Commit-Ready: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
diff --git a/scope_logger.cc b/scope_logger.cc
index 8da0b3f..24a5d12 100644
--- a/scope_logger.cc
+++ b/scope_logger.cc
@@ -47,6 +47,7 @@
   "task",
   "vpn",
   "wifi",
+  "wimax",
 };
 
 COMPILE_ASSERT(arraysize(kScopeNames) == ScopeLogger::kNumScopes,