Add 4 Windows GCE instances as build slave hosts

master/slaves.cfg

Index: master/slaves.cfg
diff --git a/master/slaves.cfg b/master/slaves.cfg
index ab0242df161d003dbdded52d8e76ef6ccdd056b2..9af27fd5a3416d0b509d0e3bbee34fe55cf7160b 100644
--- a/master/slaves.cfg
+++ b/master/slaves.cfg
@@ -16,6 +16,7 @@ INTEGER_WIDTH = 3
 DEFAULT_CONCURRENT_BUILDSLAVES = range(4)
 DEFAULT_COMPILE_BUILDSLAVES = range(10)
 WIN7_COMPILE_BUILDSLAVES = (0, 4)
+WIN7_GCE_COMPILE_BUILDSLAVES = range(10)
 WIN8_COMPILE_BUILDSLAVES = range(2)
 ANDROID_KEEPALIVE_CONDITION = ['python',
     'buildbot/slave/skia_slave_scripts/android_verify_device.py', '--serial',
@@ -51,6 +52,17 @@ LINUX_COMPILE_BUILDERS = [
   'Build-Ubuntu13.10-GCC4.8-Arm7-Release-CrOS_Daisy',
   'Build-Ubuntu13.10-Clang-x86_64-Debug',
 ]
+WIN7_COMPILE_BUILDERS = [
+  'Build-Win7-VS2010-x86-Debug',
+  'Build-Win7-VS2010-x86-Release',
+  'Build-Win7-VS2010-x86_64-Debug',
+  'Build-Win7-VS2010-x86_64-Release',
+  'Build-Win7-VS2010-x86-Debug-ANGLE',
+  'Build-Win7-VS2010-x86-Release-ANGLE',
+  'Build-Win7-VS2010-x86-Debug-DirectWrite',
+  'Build-Win7-VS2010-x86-Release-DirectWrite',
+  'Build-Win7-VS2010-x86-Debug-Exceptions',
+]
 
 
 def _Format(obj, dictionary):
@@ -525,18 +537,14 @@ slaves = [SelfReferenceFormat(d) for d in [
 ] + [
   {
     'master': 'CompileSkia',
+    'hostname': 'skiabot-win-vm-%s' % ('%d' % i).zfill(INTEGER_WIDTH),
+    'builder': WIN7_COMPILE_BUILDERS,
+  } for i in WIN7_GCE_COMPILE_BUILDSLAVES
+] + [
+  {
+    'master': 'CompileSkia',
     'hostname': 'skiabot-win-compile-%s' % ('%d' % i).zfill(INTEGER_WIDTH),
-    'builder': [
-        'Build-Win7-VS2010-x86-Debug',
-        'Build-Win7-VS2010-x86-Release',
-        'Build-Win7-VS2010-x86_64-Debug',
-        'Build-Win7-VS2010-x86_64-Release',
-        'Build-Win7-VS2010-x86-Debug-ANGLE',
-        'Build-Win7-VS2010-x86-Release-ANGLE',
-        'Build-Win7-VS2010-x86-Debug-DirectWrite',
-        'Build-Win7-VS2010-x86-Release-DirectWrite',
-        'Build-Win7-VS2010-x86-Debug-Exceptions',
-        ],
+    'builder': WIN7_COMPILE_BUILDERS,
   } for i in WIN7_COMPILE_BUILDSLAVES
 ] + [
   {