Move session into //blimp/client/app and update GN files.

testing/buildbot/gn_isolate_map.pyl

 ## 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.
 
 # gn_isolate_map.pyl - A mapping of Ninja build target names to GN labels and
 # test type classifications for the tests that are run on the bots.
 #
 # This mapping is used by MB so that we can uniformly refer to test binaries
 # by their Ninja target names in the recipes and not need to worry about how
 # they are referred to in GN or GYP specifically (the GYP target name is pretty
@@ skipping 156 matching lines @@
   },
   "battor_agent_unittests": {
     "label": "//tools/battor_agent:battor_agent_unittests",
     "type": "console_test_launcher",
   },
   "blimp_browsertests": {
     "label": "//blimp:blimp_browsertests",
     "type": "console_test_launcher",
   },
   "blimp_test_apk": {
-    "label": "//blimp/client:blimp_test_apk",
+    "label": "//blimp/client/app:blimp_test_apk",
     "type": "console_test_launcher",
   },
   "blimp_unittests": {
     "label": "//blimp:blimp_unittests",
     "type": "console_test_launcher",
   },
   "blink_heap_unittests": {
     "label": "//third_party/WebKit/Source/platform/heap:blink_heap_unittests",
     "type": "console_test_launcher",
   },
@@ skipping 770 matching lines @@
   },
   "wtf_unittests": {
     "label": "//third_party/WebKit/Source/wtf:wtf_unittests",
     "type": "console_test_launcher",
   },
   "xmllite_xmpp_unittests": {
     "label": "//webrtc:xmllite_xmpp_unittests",
     "type": "console_test_launcher",
   }
 }