Stack sampling profiler: re-enable stack collection for stacks terminated by leaf functions

chrome/browser/chrome_browser_main.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/chrome_browser_main.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 522 matching lines @@
       g_browser_process->CreateDevToolsHttpProtocolHandler(
           chrome::HOST_DESKTOP_TYPE_NATIVE,
           "127.0.0.1",
           static_cast<uint16>(port));
     } else {
       DLOG(WARNING) << "Invalid http debugger port number " << port;
     }
   }
 }
 
+base::StackSamplingProfiler::SamplingParams GetStartupSamplingParams() {
+  // Sample at 10Hz for 30 seconds.
+  base::StackSamplingProfiler::SamplingParams params;
+  params.initial_delay = base::TimeDelta::FromMilliseconds(0);
+  params.bursts = 1;
+  params.samples_per_burst = 300;
+  params.sampling_interval = base::TimeDelta::FromMilliseconds(100);
+  return params;
+}
+
 }  // namespace
 
 namespace chrome_browser {
 
 // This error message is not localized because we failed to load the
 // localization data files.
 #if defined(OS_WIN)
 const char kMissingLocaleDataTitle[] = "Missing File Error";
 #endif  // defined(OS_WIN)
 
 #if defined(OS_WIN)
 // TODO(port) This should be used on Linux Aura as well. http://crbug.com/338969
 const char kMissingLocaleDataMessage[] =
     "Unable to find locale data files. Please reinstall.";
 #endif  // defined(OS_WIN)
 
 }  // namespace chrome_browser
 
 // BrowserMainParts ------------------------------------------------------------
 
 ChromeBrowserMainParts::ChromeBrowserMainParts(
     const content::MainFunctionParams& parameters)
     : parameters_(parameters),
       parsed_command_line_(parameters.command_line),
       result_code_(content::RESULT_CODE_NORMAL_EXIT),
       startup_watcher_(new StartupTimeBomb()),
       shutdown_watcher_(new ShutdownWatcherHelper()),
       browser_field_trials_(parameters.command_line),
+      sampling_profiler_(
+          base::PlatformThread::CurrentId(),
+          GetStartupSamplingParams(),
+          metrics::CallStackProfileMetricsProvider::GetProfilerCallback(
+              metrics::CallStackProfileMetricsProvider::Params(
+                  metrics::CallStackProfileMetricsProvider::PROCESS_STARTUP,
+                  false))),
       profile_(NULL),
       run_message_loop_(true),
       notify_result_(ProcessSingleton::PROCESS_NONE),
       local_state_(NULL),
       restart_last_session_(false) {
+  const version_info::Channel channel =
+      chrome::VersionInfo::GetChannel();
+  if (channel == version_info::Channel::UNKNOWN ||
+      channel == version_info::Channel::CANARY ||
+      channel == version_info::Channel::DEV) {
+    sampling_profiler_.Start();
+  }
+
   // If we're running tests (ui_task is non-null).
   if (parameters.ui_task)
     browser_defaults::enable_help_app = false;
 
   // Chrome disallows cookies by default. All code paths that want to use
   // cookies need to go through one of Chrome's URLRequestContexts which have
   // a ChromeNetworkDelegate attached that selectively allows cookies again.
   net::URLRequest::SetDefaultCookiePolicyToBlock();
 }
 
@@ skipping 1212 matching lines @@
   chromeos::CrosSettings::Shutdown();
 #endif  // defined(OS_CHROMEOS)
 #endif  // defined(OS_ANDROID)
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }