Added UMA statistics for Chrome Cleaner.

chrome/browser/component_updater/sw_reporter_installer_win.cc

Index: chrome/browser/component_updater/sw_reporter_installer_win.cc
diff --git a/chrome/browser/component_updater/sw_reporter_installer_win.cc b/chrome/browser/component_updater/sw_reporter_installer_win.cc
index f7beb46f81dfaacf0fd5411bf88a86ed98f615f1..11e29e04491fc43e3613cf1e735d1fdfb5bc5ec6 100644
--- a/chrome/browser/component_updater/sw_reporter_installer_win.cc
+++ b/chrome/browser/component_updater/sw_reporter_installer_win.cc
@@ -82,7 +82,11 @@ const base::FilePath::CharType kSwReporterExeName[] =
 // Where to fetch the reporter exit code in the registry.
 const wchar_t kSoftwareRemovalToolRegistryKey[] =
     L"Software\\Google\\Software Removal Tool";
+const wchar_t kCleanerSuffixRegistryKey[] = L"Cleaner";
 const wchar_t kExitCodeRegistryValueName[] = L"ExitCode";
+const wchar_t kVersionRegistryValueName[] = L"Version";
+const wchar_t kStartTimeRegistryValueName[] = L"StartTime";
+const wchar_t kEndTimeRegistryValueName[] = L"EndTime";
 
 // Field trial strings.
 const char kSRTPromptTrialName[] = "SRTPromptFieldTrial";
@@ -329,6 +333,48 @@ void RegisterSwReporterComponent(ComponentUpdateService* cus,
     return;
   }
 
+  // Check if we have information from Cleaner and record UMA statistics.
+  base::string16 cleaner_key_name(kSoftwareRemovalToolRegistryKey);
+  cleaner_key_name.append(1, L'\\').append(kCleanerSuffixRegistryKey);
+  base::win::RegKey cleaner_key(
+      HKEY_CURRENT_USER, cleaner_key_name.c_str(), KEY_ALL_ACCESS);
+  // Cleaner is assumed to have run if we have a start time.
+  if (cleaner_key.Valid() &&
+      cleaner_key.HasValue(kStartTimeRegistryValueName)) {
+    // Get version number.
+    if (cleaner_key.HasValue(kVersionRegistryValueName)) {
+      DWORD version;
+      cleaner_key.ReadValueDW(kVersionRegistryValueName, &version);
+      UMA_HISTOGRAM_SPARSE_SLOWLY("SoftwareReporter.Cleaner.Version", version);
+      cleaner_key.DeleteValue(kVersionRegistryValueName);
+    }
+    // Get start & end time.
+    if (cleaner_key.HasValue(kEndTimeRegistryValueName)) {
+      int64 start_time_value;
+      cleaner_key.ReadInt64(kStartTimeRegistryValueName, &start_time_value);
+      int64 end_time_value;
+      cleaner_key.ReadInt64(kEndTimeRegistryValueName, &end_time_value);
+      cleaner_key.DeleteValue(kEndTimeRegistryValueName);
+      base::TimeDelta run_time(base::Time::FromInternalValue(end_time_value) -
+          base::Time::FromInternalValue(start_time_value));
+      UMA_HISTOGRAM_LONG_TIMES("SoftwareReporter.Cleaner.RunningTime",
+          run_time);
+      UMA_HISTOGRAM_BOOLEAN("SoftwareReporter.Cleaner.HasCompleted", true);
+    } else {
+      // If we don't have an end time, we can assume the cleaner crashed.
+      UMA_HISTOGRAM_BOOLEAN("SoftwareReporter.Cleaner.HasCompleted", false);

[Alexei Svitkine (slow), 2014/10/30 14:02:24]

Nit: Each histogram macro actually expands to a non-trivial block of code that
bloats the binary. So I suggest not repeating the macro for the same histogram.
How about the following structure?

// If we don't have an end time, we can assume the cleaner crashed.
bool completed = cleaner_key.HasValue(kEndTimeRegistryValueName);
UMA_HISTOGRAM_BOOLEAN("SoftwareReporter.Cleaner.HasCompleted", completed);
if (completed) {
   ...
}

[Georges Khalil, 2014/10/30 14:44:53]

Done.

+    }
+    // Get exit code.
+    if (cleaner_key.HasValue(kExitCodeRegistryValueName)) {
+      DWORD exit_code;
+      cleaner_key.ReadValueDW(kExitCodeRegistryValueName, &exit_code);
+      UMA_HISTOGRAM_SPARSE_SLOWLY("SoftwareReporter.Cleaner.ExitCode",
+          exit_code);
+      cleaner_key.DeleteValue(kExitCodeRegistryValueName);
+    }
+    cleaner_key.DeleteValue(kStartTimeRegistryValueName);
+  }
+
   // Install the component.
   scoped_ptr<ComponentInstallerTraits> traits(
       new SwReporterInstallerTraits(prefs));