Move Android Nexus 9 GPU bot to chromium.gpu.fyi waterfall.

scripts/slave/recipes/chromium.gpu.recipe_autogen.expected/Android_Debug__Nexus_9_.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
-      "chromium.gpu",
+      "chromium.gpu.fyi",
       "--builder",
       "Android Debug (Nexus 9)",
       "--slave",
       "TestSlave",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'custom_deps': {'src/third_party/WebKit/LayoutTests': None}, 'custom_vars': {'googlecode_url': 'http://%s.googlecode.com/svn', 'llvm_url': 'http://llvm.org/svn/llvm-project', 'nacl_trunk': 'http://src.chromium.org/native_client/trunk', 'sourceforge_url': 'https://svn.code.sf.net/p/%(repo)s/code', 'webkit_trunk': 'http://src.chromium.org/blink/trunk'}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]\ntarget_os = ['android']",
       "--root",
       "src",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\", \"src/third_party/WebKit\": \"got_webkit_revision\", \"src/tools/swarming_client\": \"got_swarming_client_revision\", \"src/v8\": \"got_v8_revision\"}",
@@ skipping 84 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "src/build/android/buildbot/bb_run_bot.py",
-      "--build-properties={\"buildername\":\"Android Debug (Nexus 9)\",\"mastername\":\"chromium.gpu\",\"recipe\":\"chromium.gpu.recipe_autogen\",\"slavename\":\"TestSlave\"}",
+      "--build-properties={\"buildername\":\"Android Debug (Nexus 9)\",\"mastername\":\"chromium.gpu.fyi\",\"recipe\":\"chromium.gpu.recipe_autogen\",\"slavename\":\"TestSlave\"}",
       "--factory-properties={\"GYP_DEFINES\":\" component=shared_library\",\"android_bot_id\":\"gpu-builder-tests-dbg\",\"clobber\":false,\"gclient_env\":{},\"gclient_timeout\":3600,\"target\":\"Debug\",\"target_os\":\"android\"}"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "slave_steps"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]