Add a Win Clang deterministic builder.

scripts/slave/recipes/swarming/deterministic_build.expected/full_chromium_swarm_Windows_Clang_deterministic_build.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\cleanup_temp.py"
     ],
     "name": "cleanup_temp"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\bot_update.py",
       "--master",
       "chromium.swarm",
       "--builder",
-      "Windows deterministic build",
+      "Windows Clang deterministic build",
       "--slave",
       "TestSlavename",
       "--spec",
       "cache_dir = None\nsolutions = [{'custom_vars': {'googlecode_url': 'svn://svn-mirror.golo.chromium.org/%s', 'nacl_trunk': 'svn://svn-mirror.golo.chromium.org/native_client/trunk', 'sourceforge_url': 'svn://svn-mirror.golo.chromium.org/%(repo)s', 'webkit_trunk': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]",
       "--root",
       "src",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\", \"src/native_client\": \"got_nacl_revision\", \"src/third_party/WebKit\": \"got_webkit_revision\", \"src/third_party/webrtc\": \"got_webrtc_revision\", \"src/tools/swarming_client\": \"got_swarming_client_revision\", \"src/v8\": \"got_v8_revision\"}",
       "--output_json",
       "/path/to/tmp/json",
@@ skipping 41 matching lines @@
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]\\gclient.py",
       "runhooks"
     ],
     "env": {
-      "GYP_DEFINES": "chromium_win_pch=0 component=static_library dont_embed_build_metadata=1 fastbuild=1 gomadir='[BUILD]\\goma' target_arch=ia32 test_isolation_mode=prepare use_goma=1"
+      "GYP_DEFINES": "clang=1 component=static_library dont_embed_build_metadata=1 fastbuild=1 target_arch=ia32 test_isolation_mode=prepare"

[Sébastien Marchand, 2015/04/03 00:15:00]

proof #1

     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\compile.py",
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]\\src",
       "--build-tool",
       "ninja",
       "--compiler",
-      "goma",
-      "--goma-dir",
-      "[BUILD]\\goma",
+      "clang",

[Sébastien Marchand, 2015/04/03 00:15:00]

proof #2

       "--clobber",
       "--",
       "chromium_swarm_tests"
     ],
     "name": "First build"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 64 matching lines @@
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]\\gclient.py",
       "runhooks"
     ],
     "env": {
-      "GYP_DEFINES": "chromium_win_pch=0 component=static_library dont_embed_build_metadata=1 fastbuild=1 gomadir='[BUILD]\\goma' target_arch=ia32 test_isolation_mode=prepare use_goma=1"
+      "GYP_DEFINES": "clang=1 component=static_library dont_embed_build_metadata=1 fastbuild=1 target_arch=ia32 test_isolation_mode=prepare"
     },
     "name": "gclient runhooks (2)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]\\scripts\\slave\\compile.py",
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]\\src",
       "--build-tool",
       "ninja",
       "--compiler",
-      "goma",
-      "--goma-dir",
-      "[BUILD]\\goma",
+      "clang",
       "--clobber",
       "--",
       "chromium_swarm_tests"
     ],
     "name": "Second build"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 68 matching lines @@
       "[SLAVE_BUILD]\\src\\out\\Release.1",
       "--second-build-dir",
       "[SLAVE_BUILD]\\src\\out\\Release.2",
       "--target-platform",
       "win"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "compare_build_artifacts"
   }
 ]