Persist setup metrics and have Chrome report them during UMA upload.

chrome/browser/metrics/chrome_metrics_service_client.cc

Index: chrome/browser/metrics/chrome_metrics_service_client.cc
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.cc b/chrome/browser/metrics/chrome_metrics_service_client.cc
index d980cd98e78afe021b813522d49ddbd23d5cbaee..91cf8892bdf142cf6dbaa8b6fc60024ffaf90d43 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_client.cc
@@ -32,8 +32,10 @@
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/crash_keys.h"
 #include "chrome/common/features.h"
+#include "chrome/installer/util/util_constants.h"
 #include "components/metrics/call_stack_profile_metrics_provider.h"
 #include "components/metrics/drive_metrics_provider.h"
+#include "components/metrics/file_metrics_provider.h"
 #include "components/metrics/gpu/gpu_metrics_provider.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/metrics/metrics_service.h"
@@ -177,6 +179,9 @@ void ChromeMetricsServiceClient::RegisterPrefs(PrefRegistrySimple* registry) {
   metrics::MetricsService::RegisterPrefs(registry);
   metrics::StabilityMetricsHelper::RegisterPrefs(registry);
 
+  metrics::FileMetricsProvider::RegisterPrefs(
+      registry, installer::kSetupHistogramAllocatorName);
+
 #if BUILDFLAG(ANDROID_JAVA_UI)
   AndroidMetricsProvider::RegisterPrefs(registry);
 #endif  // BUILDFLAG(ANDROID_JAVA_UI)
@@ -335,6 +340,19 @@ void ChromeMetricsServiceClient::Initialize() {
       scoped_ptr<metrics::MetricsProvider>(
           new metrics::ScreenInfoMetricsProvider));
 
+#if defined(OS_WIN)
+  scoped_ptr<metrics::FileMetricsProvider> file_metrics(
+      new metrics::FileMetricsProvider(metrics_service_.get(),
+                                       g_browser_process->local_state()));
+  file_metrics->RegisterFile(
+      base::CommandLine::ForCurrentProcess()->GetProgram().DirName()
+          .AppendASCII(installer::kSetupHistogramAllocatorName)
+          .AddExtension(L".pma"),
+      metrics::FileMetricsProvider::FILE_HISTOGRAMS_ATOMIC,
+      installer::kSetupHistogramAllocatorName);
+  metrics_service_->RegisterMetricsProvider(std::move(file_metrics));
+#endif
+
   drive_metrics_provider_ = new metrics::DriveMetricsProvider(
       content::BrowserThread::GetMessageLoopProxyForThread(
           content::BrowserThread::FILE),
@@ -523,7 +541,7 @@ void ChromeMetricsServiceClient::OnMemoryDetailCollectionDone() {
   }
 #endif  // !ENABLE_PRINT_PREVIEW
 
-  // Set up the callback to task to call after we receive histograms from all
+  // Set up the callback task to call after we receive histograms from all
   // child processes. |timeout| specifies how long to wait before absolutely
   // calling us back on the task.
   content::FetchHistogramsAsynchronously(base::MessageLoop::current(), callback,