Instrument MojoShellConnectionImpl::BindToMessagePipe

content/child/child_thread_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 "content/child/child_thread_impl.h"
 
 #include <signal.h>
 #include <string>
 #include <utility>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/leak_annotations.h"
 #include "base/debug/profiler.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/timer_slack.h"
 #include "base/metrics/field_trial.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/process/process.h"
 #include "base/process/process_handle.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/synchronization/condition_variable.h"
 #include "base/synchronization/lock.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/thread_local.h"
+#include "base/timer/elapsed_timer.h"
 #include "base/tracked_objects.h"
 #include "build/build_config.h"
 #include "components/tracing/child_trace_message_filter.h"
 #include "content/child/child_discardable_shared_memory_manager.h"
 #include "content/child/child_gpu_memory_buffer_manager.h"
 #include "content/child/child_histogram_message_filter.h"
 #include "content/child/child_process.h"
 #include "content/child/child_resource_message_filter.h"
 #include "content/child/child_shared_bitmap_manager.h"
 #include "content/child/fileapi/file_system_dispatcher.h"
@@ skipping 371 matching lines @@
   }
 
   // If this process was launched with a primordial pipe token, we exchange it
   // for a pipe to connect to the shell.
   std::string pipe_token =
       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           switches::kMojoPrimordialPipeToken);
   if (!pipe_token.empty() && MojoShellConnectionImpl::Get()) {
     mojo::ScopedMessagePipeHandle pipe =
         mojo::edk::CreateChildMessagePipe(pipe_token);
+
+    base::ElapsedTimer timer;
     MojoShellConnectionImpl::Get()->BindToMessagePipe(std::move(pipe));
+    UMA_HISTOGRAM_TIMES("Mojo.Shell.ChildConnectionTime", timer.Elapsed());
   }
 
   mojo_application_.reset(new MojoApplication(GetIOTaskRunner()));
 
   sync_message_filter_ = channel_->CreateSyncMessageFilter();
   thread_safe_sender_ = new ThreadSafeSender(
       message_loop_->task_runner(), sync_message_filter_.get());
 
   resource_dispatcher_.reset(new ResourceDispatcher(
       this, message_loop()->task_runner()));
@@ skipping 313 matching lines @@
 void ChildThreadImpl::EnsureConnected() {
   VLOG(0) << "ChildThreadImpl::EnsureConnected()";
   base::Process::Current().Terminate(0, false);
 }
 
 bool ChildThreadImpl::IsInBrowserProcess() const {
   return browser_process_io_runner_;
 }
 
 }  // namespace content