Flapper field trial to use workerpool for sync file operations.

chrome/common/pepper_flash.cc

Index: chrome/common/pepper_flash.cc
diff --git a/chrome/common/pepper_flash.cc b/chrome/common/pepper_flash.cc
index a13b22106d54481b325765920984062494261e16..d938be203b21e1b7e17db4ac39428c34275c8621 100644
--- a/chrome/common/pepper_flash.cc
+++ b/chrome/common/pepper_flash.cc
@@ -4,8 +4,36 @@
 
 #include "chrome/common/pepper_flash.h"
 
+#include "base/memory/ref_counted.h"
+#include "base/metrics/field_trial.h"
+
 #include "ppapi/shared_impl/ppapi_permissions.h"
 
+namespace {
+
+const char* const kIOFieldTrialName = "FlapperIOThread";
+const char* const kPoolGroupName = "PoolThread";
+const char* const kFileGroupName = "FileThread";
+
+}  // namespace
+
+void ActivatePepperFlashThreadFieldTrial() {
+  static bool activated = false;
+  if (activated)
+    return;
+
+  activated = true;
+
+  // The field trial will expire on Jan 1st, 2014.
+  scoped_refptr<base::FieldTrial> trial(
+      base::FieldTrialList::FactoryGetFieldTrial(
+          kIOFieldTrialName, 1000, kPoolGroupName, 2014, 1, 1,
+          NULL));
+
+  // 50% goes into the FILE thread group.
+  trial->AppendGroup(kFileGroupName, 500);
+}
+
 bool ConductingPepperFlashFieldTrial() {
 #if defined(OS_WIN)
   return true;