Fix field trial DCHECK when gpu process is in-process.

chrome/gpu/chrome_content_gpu_client.cc

 // Copyright 2016 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/gpu/chrome_content_gpu_client.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "chrome/common/stack_sampling_configuration.h"
 #include "components/metrics/child_call_stack_profile_collector.h"
+#include "content/public/common/content_switches.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/interface_registry.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/gpu/gpu_arc_video_service.h"
 #endif
 
 namespace {
 
@@ skipping 32 matching lines @@
                 metrics::CallStackProfileParams::MAY_SHUFFLE))) {
   if (StackSamplingConfiguration::Get()->IsProfilerEnabledForCurrentProcess())
     stack_sampling_profiler_.Start();
 }
 
 ChromeContentGpuClient::~ChromeContentGpuClient() {}
 
 void ChromeContentGpuClient::Initialize(
     base::FieldTrialList::Observer* observer) {
   DCHECK(!field_trial_syncer_);
-  field_trial_syncer_.reset(
-      new chrome_variations::ChildProcessFieldTrialSyncer(observer));
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
-  field_trial_syncer_->InitFieldTrialObserving(command_line);
+  // No need for field trial syncer if we're in the browser process.
+  if (!command_line.HasSwitch(switches::kInProcessGPU)) {
+    field_trial_syncer_.reset(
+        new chrome_variations::ChildProcessFieldTrialSyncer(observer));
+    field_trial_syncer_->InitFieldTrialObserving(command_line);
+  }
 }
 
 void ChromeContentGpuClient::ExposeInterfacesToBrowser(
     service_manager::InterfaceRegistry* registry,
     const gpu::GpuPreferences& gpu_preferences) {
 #if defined(OS_CHROMEOS)
   registry->AddInterface(
       base::Bind(&CreateGpuArcVideoService, gpu_preferences));
   registry->AddInterface(
       base::Bind(&DeprecatedCreateGpuArcVideoService, gpu_preferences));
 #endif
 }
 
 void ChromeContentGpuClient::ConsumeInterfacesFromBrowser(
     service_manager::InterfaceProvider* provider) {
   metrics::mojom::CallStackProfileCollectorPtr browser_interface;
   provider->GetInterface(&browser_interface);
   g_call_stack_profile_collector.Get().SetParentProfileCollector(
       std::move(browser_interface));
 }