Simulate variation seeds using installed version string.

chrome/browser/upgrade_detector_impl.cc

Index: chrome/browser/upgrade_detector_impl.cc
===================================================================
--- chrome/browser/upgrade_detector_impl.cc	(revision 277860)
+++ chrome/browser/upgrade_detector_impl.cc	(working copy)
@@ -20,7 +20,6 @@
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
-#include "base/version.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/google/google_brand.h"
 #include "chrome/common/chrome_switches.h"
@@ -252,18 +251,11 @@
 UpgradeDetectorImpl::~UpgradeDetectorImpl() {
 }
 
-// Static
-// This task checks the currently running version of Chrome against the
-// installed version. If the installed version is newer, it calls back
-// UpgradeDetectorImpl::UpgradeDetected using a weak pointer so that it can
-// be interrupted from the UI thread.
-void UpgradeDetectorImpl::DetectUpgradeTask(
-    base::WeakPtr<UpgradeDetectorImpl> upgrade_detector) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+// static
+base::Version UpgradeDetectorImpl::GetCurrentlyInstalledVersion() {
+  base::ThreadRestrictions::AssertIOAllowed();
 
   Version installed_version;
-  Version critical_update;
-
 #if defined(OS_WIN)
   // Get the version of the currently *installed* instance of Chrome,
   // which might be newer than the *running* instance if we have been
@@ -274,11 +266,6 @@
   // thing to do.
   BrowserDistribution* dist = BrowserDistribution::GetDistribution();
   InstallUtil::GetChromeVersion(dist, system_install, &installed_version);
-
-  if (installed_version.IsValid()) {
-    InstallUtil::GetCriticalUpdateVersion(dist, system_install,
-                                          &critical_update);
-  }
 #elif defined(OS_MACOSX)
   installed_version =
       Version(base::UTF16ToASCII(keystone_glue::CurrentlyInstalledVersion()));
@@ -294,7 +281,27 @@
 
   installed_version = Version(reply);
 #endif
+  return installed_version;
+}
 
+// static
+// This task checks the currently running version of Chrome against the
+// installed version. If the installed version is newer, it calls back
+// UpgradeDetectorImpl::UpgradeDetected using a weak pointer so that it can
+// be interrupted from the UI thread.
+void UpgradeDetectorImpl::DetectUpgradeTask(
+    base::WeakPtr<UpgradeDetectorImpl> upgrade_detector) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+
+  Version installed_version = GetCurrentlyInstalledVersion();
+  Version critical_update;
+#if defined(OS_WIN)
+  if (installed_version.IsValid()) {
+    InstallUtil::GetCriticalUpdateVersion(dist, system_install,
+                                          &critical_update);
+  }
+#endif
+
   // Get the version of the currently *running* instance of Chrome.
   chrome::VersionInfo version_info;
   if (!version_info.is_valid()) {
@@ -436,9 +443,9 @@
     // second.
     const int kUnstableThreshold = 1;
 
-    if (is_critical_or_outdated)
+    if (is_critical_or_outdated) {
       set_upgrade_notification_stage(UPGRADE_ANNOYANCE_CRITICAL);
-    else if (time_passed >= kUnstableThreshold) {
+    } else if (time_passed >= kUnstableThreshold) {
       set_upgrade_notification_stage(UPGRADE_ANNOYANCE_LOW);
 
       // That's as high as it goes.