[Compiler] Track Ignition background compilation separately in RuntimeStats.

tools/callstats.html

Index: tools/callstats.html
diff --git a/tools/callstats.html b/tools/callstats.html
index da65418cb6e9489f75e40ee7e401353316c94e28..8825f48a5d2966ae83cc1ccfce06ebc40ec5e837 100644
--- a/tools/callstats.html
+++ b/tools/callstats.html
@@ -1443,6 +1443,7 @@ code is governed by a BSD-style license that can be found in the LICENSE file.
           this.total,
           Group.groups.get('ic').entry(),
           Group.groups.get('optimize').entry(),
+          Group.groups.get('compile-background').entry(),
           Group.groups.get('compile').entry(),
           Group.groups.get('parse-background').entry(),
           Group.groups.get('parse').entry(),
@@ -1651,6 +1652,8 @@ code is governed by a BSD-style license that can be found in the LICENSE file.
     Group.add('ic', new Group('IC', /.*IC_.*/, "#3366CC"));
     Group.add('optimize', new Group('Optimize',
         /StackGuard|.*Optimize.*|.*Deoptimize.*|Recompile.*/, "#DC3912"));
+    Group.add('compile-background', new Group('Compile-Background',
+        /(.*CompileBackground.*)/, "#b9a720"));
     Group.add('compile', new Group('Compile',
         /(^Compile.*)|(.*_Compile.*)/, "#FFAA00"));
     Group.add('parse-background',