Report histogram creation results.

chrome/installer/setup/installer_metrics.cc

Index: chrome/installer/setup/installer_metrics.cc
diff --git a/chrome/installer/setup/installer_metrics.cc b/chrome/installer/setup/installer_metrics.cc
index 8e5f0443e437f7589493be0818c56ef397cf2b17..5826b1c4b6372f7a0bb3245d3469a9b616d89ce6 100644
--- a/chrome/installer/setup/installer_metrics.cc
+++ b/chrome/installer/setup/installer_metrics.cc
@@ -21,6 +21,10 @@ void BeginPersistentHistogramStorage() {
           installer::kSetupHistogramAllocatorName));
   base::GetPersistentHistogramMemoryAllocator()->CreateTrackingHistograms(
       installer::kSetupHistogramAllocatorName);
+
+  // This can't be enabled until after the allocator is configured because
+  // there is no other reporting out of setup other than persistent memory.
+  base::HistogramBase::EnableActivityReportHistogram("setup");
 }
 
 void EndPersistentHistogramStorage(const base::FilePath& target_path) {