Add Precise try slaves: vm[750-781]-m4

build/masters/master.tryserver.chromium/master.cfg

Index: build/masters/master.tryserver.chromium/master.cfg
===================================================================
--- build/masters/master.tryserver.chromium/master.cfg	(revision 186741)
+++ build/masters/master.tryserver.chromium/master.cfg	(working copy)
@@ -499,6 +499,18 @@
       'use_xvfb_on_linux': True,
     })
 
+b_linux_precise = CreateBuilder(
+    platform='linux',
+    target='Debug',
+    goma=True,
+    options=common_targets + ['dbus_unittests'],
+    tests=linux_tests,
+    builder_name='linux_precise',
+    slavebuilddir='linux_precise',
+    factory_properties={
+      'use_xvfb_on_linux': True,
+    })
+
 b_linux_rel_precise = CreateBuilder(
     platform='linux',
     target='Release',
@@ -1822,7 +1834,8 @@
 }
 
 c['builders'] = [
-  b_linux_rel, b_linux_rel_alt, b_linux_rel_precise, b_linux_rel_precise32,
+  b_linux_rel, b_linux_rel_alt,
+  b_linux_precise, b_linux_rel_precise, b_linux_rel_precise32,
   b_mac_rel, b_win_rel,
   b_win_x64_rel,
   b_linux_rel_naclmore, b_mac_rel_naclmore, b_win_rel_naclmore,