Add UMA and Rappor metrics to capture URLs passed in at startup.

chrome/browser/ui/startup/startup_browser_creator_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/startup/startup_browser_creator_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "apps/app_restore_service.h"
 #include "apps/app_restore_service_factory.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "chrome/browser/apps/install_chrome_app.h"
 #include "chrome/browser/auto_launch_trial.h"
@@ skipping 42 matching lines @@
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_result_codes.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_metrics.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/locale_settings.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "components/google/core/browser/google_util.h"
+#include "components/rappor/rappor_utils.h"
 #include "content/public/browser/child_process_security_policy.h"
 #include "content/public/browser/dom_storage_context.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
@@ skipping 226 matching lines @@
       welcome_run_type_(WelcomeRunType::NONE) {
 }
 
 StartupBrowserCreatorImpl::~StartupBrowserCreatorImpl() {
 }
 
 bool StartupBrowserCreatorImpl::Launch(Profile* profile,
                                        const std::vector<GURL>& urls_to_open,
                                        bool process_startup,
                                        chrome::HostDesktopType desktop_type) {
+  UMA_HISTOGRAM_COUNTS_100("Startup.BrowserLaunchURLCount",
+                           urls_to_open.size());

[Peter Kasting, 2015/08/12 22:28:23]

Nit: To avoid a (currently disabled) warning on MSVC< you should probably pass:

static_cast<base::HistogramBase::Sample>(urls_to_open.size())

[rkaplow, 2015/08/12 22:37:40]

The current convention for this macro is just a number. I would think it would
make sense to switch them all at once (if we want to do this) instead of
piecemeal.

Let me know if that is ok.

[Peter Kasting, 2015/08/12 22:46:11]

I'm not sure if I'm being clear.  Passing a number is fine.  Passing a variable
is fine if the variable can be losslessly converted to Sample (which is a
typedef for int32).  The problem is that you're passing a size_t, which is not
guaranteed to fit in an int32, and that will trigger the warning.  Hence the
cast.

Few histogram callers pass size_ts, so this cast is rarely needed.  So this
isn't a matter of trying to systematically change something throughout the
codebase.

[rkaplow, 2015/08/13 02:11:58]

Ah thanks, that makes sense.

+  RecordRapporOnStartupURLs(urls_to_open);
+
   DCHECK(profile);
   profile_ = profile;
 
   if (command_line_.HasSwitch(switches::kDnsLogDetails))
     chrome_browser_net::EnablePredictorDetailedLog(true);
 
   if (AppListService::HandleLaunchCommandLine(command_line_, profile))
     return true;
 
   if (command_line_.HasSwitch(switches::kAppId)) {
@@ skipping 670 matching lines @@
   }
 
   // Remember that the welcome page was shown for this OS version.
   local_state->SetString(prefs::kLastWelcomedOSVersion, this_version);
 #else  // OS_WIN
   // Show the welcome page as the last tab only on first-run.
   if (first_run::ShouldShowWelcomePage())
     welcome_run_type_ = WelcomeRunType::FIRST_RUN_LAST_TAB;
 #endif  // !OS_WIN
 }
+
+void StartupBrowserCreatorImpl::RecordRapporOnStartupURLs(
+    const std::vector<GURL>& urls_to_open) {
+  for (const GURL& url : urls_to_open) {
+    rappor::SampleDomainAndRegistryFromGURL(g_browser_process->rappor_service(),
+                                            "Startup.BrowserLaunchURL", url);
+  }
+}