Add stats collection for telemetry startup.warm.blank_page test.

mojo/runner/context.cc

 // Copyright 2013 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 "mojo/runner/context.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/path_service.h"
+#include "base/process/process_info.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
 #include "components/devtools_service/public/cpp/switches.h"
 #include "components/devtools_service/public/interfaces/devtools_service.mojom.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/application/public/cpp/application_delegate.h"
@@ skipping 279 matching lines @@
 
   ServiceProviderPtr tracing_service_provider_ptr;
   new TracingServiceProvider(GetProxy(&tracing_service_provider_ptr));
   mojo::URLRequestPtr request(mojo::URLRequest::New());
   request->url = mojo::String::From("mojo:tracing");
   application_manager_.ConnectToApplication(
       nullptr, request.Pass(), std::string(), GURL(""), nullptr,
       tracing_service_provider_ptr.Pass(),
       shell::GetPermissiveCapabilityFilter(), base::Closure());
 
+  // Record the shell process creation time for performance testing.
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kStatsCollectionController)) {
+    tracing::StartupPerformanceControllerPtr controller;
+    application_manager_.ConnectToService(GURL("mojo:tracing"), &controller);

[yzshen1, 2015/08/13 15:59:12]

Please consider directly obtaining a service provider from line 313, and ask for
a StartupPerformanceControllerPtr from it. That way we avoid the cost of
connecting to the application a second time.

[msw, 2015/08/14 23:20:35]

Done.

+    const base::Time creation_time = base::CurrentProcessInfo::CreationTime();
+    controller->SetShellProcessCreationTime(creation_time.ToInternalValue());
+  }
+
   InitDevToolsServiceIfNeeded(&application_manager_, command_line);
 
   return true;
 }
 
 void Context::Shutdown() {
   TRACE_EVENT0("mojo_shell", "Context::Shutdown");
   DCHECK_EQ(base::MessageLoop::current()->task_runner(),
             task_runners_->shell_runner());
   embedder::ShutdownIPCSupport();
@@ skipping 65 matching lines @@
         base::MessageLoop::current()->Quit();
       } else {
         app_complete_callback_.Run();
       }
     }
   }
 }
 
 }  // namespace runner
 }  // namespace mojo