Split swarm_triggered into 3 builders to make it easier on devs.

masters/master.tryserver.chromium/master.cfg

Index: masters/master.tryserver.chromium/master.cfg
diff --git a/masters/master.tryserver.chromium/master.cfg b/masters/master.tryserver.chromium/master.cfg
index 107cbd7901a9dec437c01eebf9695b84aa78b508..1fad2e6c177abc715c1938c7f108f3e29c2d25a4 100644
--- a/masters/master.tryserver.chromium/master.cfg
+++ b/masters/master.tryserver.chromium/master.cfg
@@ -478,6 +478,7 @@ b_linux_rel = CreateBuilder(
     builder_name='linux_rel',
     slavebuilddir='linux',
     factory_properties={
+      'triggered_builder': 'linux_swarm_triggered',
       'use_xvfb_on_linux': True,
     },
     run_default_swarm_tests=[
@@ -616,6 +617,9 @@ b_mac_rel = CreateBuilder(
     slavebuilddir='mac',
     goma=True,
     clang=True,
+    factory_properties={
+      'triggered_builder': 'mac_swarm_triggered',
+    },
     run_default_swarm_tests=[
       'base_unittests',
       'browser_tests',
@@ -728,6 +732,7 @@ b_win_rel = CreateBuilder(
       'gclient_env': {
         'GYP_GENERATOR_FLAGS': 'msvs_error_on_missing_sources=1',
       },
+      'triggered_builder': 'win_swarm_triggered',
     },
     goma=True,
     run_default_swarm_tests=[
@@ -1602,7 +1607,8 @@ b_win_chrome_frame = CreateBuilder(
     })
 
 # Swarm Builder
-b_swarm = {
+b_swarms = [
+  {
     'auto_reboot': False,
     'factory': swarm_factory.SwarmTestBuilder(
         config.Master.swarm_server_internal_url,
@@ -1615,8 +1621,9 @@ b_swarm = {
           'sync_integration_tests',
           'unit_tests',
         ]),
-    'name': 'swarm_triggered',
-}
+    'name': '%s_swarm_triggered' % name,
+  } for name in ('linux', 'mac', 'win')
+]
 
 # Clang builders
 b_linux_clang = CreateBuilder(
@@ -2206,7 +2213,7 @@ c['builders'] = [
   b_mac_layout_rel_lion, b_mac_layout_rel_mountainlion,
   b_coverage_linux,
   b_win_chrome_frame,
-  b_swarm,
+] + b_swarms + [
   b_linux_chromeos_clang,
   b_linux_futura, b_linux_aura, b_win7_aura, b_win8_aura,
   b_linux_asan, b_linux_browser_asan, b_linux_clang_tsan,
@@ -2299,9 +2306,10 @@ c['schedulers'].append(Triggerable(
     builderNames=['android_fyi_dbg_triggered_tests']))
 
 # Triggerable scheduler for Swarm Tests.
-c['schedulers'].append(Triggerable(
-    name='swarm_triggered',
-    builderNames=['swarm_triggered']))
+for name in ('linux', 'mac', 'win'):
+  c['schedulers'].append(Triggerable(
+      name='%s_swarm_triggered' % name,
+      builderNames=['%s_swarm_triggered' % name]))
 
 # Triggerable scheduler for linux arm
 c['schedulers'].append(Triggerable(