Add ui/wm to aura_builder target

This is to mitigate the issue crbug.com/354775 by at least compiling wm_core_unittsts on bots.

BUG=354775
R=jamescook@chromium.org

Review URL: https://codereview.chromium.org/233733002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@263083 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -1160,6 +1160,7 @@
             '../ui/aura/aura.gyp:*',
             '../ui/compositor/compositor.gyp:*',
             '../ui/events/events.gyp:*',
+            '../ui/wm/wm.gyp:*',
             '../ui/gfx/gfx.gyp:gfx_unittests',
             '../ui/keyboard/keyboard.gyp:*',
             '../ui/message_center/message_center.gyp:*',