diff --git content/app/content_main_runner_impl.cc content/app/content_main_runner_impl.cc
index 0f81f0524014..b330e3902a8d 100644
--- content/app/content_main_runner_impl.cc
+++ content/app/content_main_runner_impl.cc
@@ -604,7 +604,8 @@ int RunBrowserProcessMain(
     ContentMainDelegate* delegate,
     std::unique_ptr<BrowserProcessSubThread> service_manager_thread) {
   if (delegate) {
-    int exit_code = delegate->RunProcess("", main_function_params);
+    int exit_code = delegate->RunProcess("", main_function_params,
+                                         std::move(service_manager_thread));
 #if defined(OS_ANDROID)
     // In Android's browser process, the negative exit code doesn't mean the
     // default behavior should be used as the UI message loop is managed by
diff --git content/browser/browser_main_runner_impl.h content/browser/browser_main_runner_impl.h
index adb084fe27c6..42a6fdc2d67f 100644
--- content/browser/browser_main_runner_impl.h
+++ content/browser/browser_main_runner_impl.h
@@ -42,7 +42,7 @@ class BrowserMainRunnerImpl : public BrowserMainRunner {
   // on which ServiceManager is currently running.
   int Initialize(
       const MainFunctionParams& parameters,
-      std::unique_ptr<BrowserProcessSubThread> service_manager_thread);
+      std::unique_ptr<BrowserProcessSubThread> service_manager_thread) override;
 
  private:
   // True if we have started to initialize the runner.
diff --git content/public/app/content_main_delegate.cc content/public/app/content_main_delegate.cc
index c4bdfd36ad0c..f6830c35fd1d 100644
--- content/public/app/content_main_delegate.cc
+++ content/public/app/content_main_delegate.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "build/build_config.h"
+#include "content/browser/browser_process_sub_thread.h"
 #include "content/public/gpu/content_gpu_client.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/public/utility/content_utility_client.h"
@@ -26,6 +27,13 @@ int ContentMainDelegate::RunProcess(
   return -1;
 }
 
+int ContentMainDelegate::RunProcess(
+    const std::string& process_type,
+    const MainFunctionParams& main_function_params,
+    std::unique_ptr<BrowserProcessSubThread> service_manager_thread) {
+  return RunProcess(process_type, main_function_params);
+}
+
 ui::DataPack* ContentMainDelegate::LoadServiceManifestDataPack() {
   return nullptr;
 }
diff --git content/public/app/content_main_delegate.h content/public/app/content_main_delegate.h
index 979e25d1c1b9..87ef81c4e913 100644
--- content/public/app/content_main_delegate.h
+++ content/public/app/content_main_delegate.h
@@ -30,6 +30,7 @@ class DataPack;
 
 namespace content {
 
+class BrowserProcessSubThread;
 class ContentBrowserClient;
 class ContentGpuClient;
 class ContentRendererClient;
@@ -60,6 +61,12 @@ class CONTENT_EXPORT ContentMainDelegate {
       const std::string& process_type,
       const MainFunctionParams& main_function_params);
 
+  // Asks the embedder to start a process. Return -1 for the default behavior.
+  virtual int RunProcess(
+      const std::string& process_type,
+      const MainFunctionParams& main_function_params,
+      std::unique_ptr<BrowserProcessSubThread> service_manager_thread);
+
   // Called right before the process exits.
   virtual void ProcessExiting(const std::string& process_type) {}
 
diff --git content/public/browser/browser_main_runner.h content/public/browser/browser_main_runner.h
index c01be956eded..8cbd8d894ac5 100644
--- content/public/browser/browser_main_runner.h
+++ content/public/browser/browser_main_runner.h
@@ -10,6 +10,7 @@
 
 namespace content {
 
+class BrowserProcessSubThread;
 struct MainFunctionParams;
 
 // This class is responsible for browser initialization, running and shutdown.
@@ -26,7 +27,10 @@ class CONTENT_EXPORT BrowserMainRunner {
   // Initialize all necessary browser state. The |parameters| values will be
   // copied. Returning a non-negative value indicates that initialization
   // failed, and the returned value is used as the exit code for the process.
-  virtual int Initialize(const content::MainFunctionParams& parameters) = 0;
+  virtual int Initialize(const MainFunctionParams& parameters) = 0;
+  virtual int Initialize(
+      const MainFunctionParams& parameters,
+      std::unique_ptr<BrowserProcessSubThread> service_manager_thread) = 0;
 
 #if defined(OS_ANDROID)
   // Run all queued startup tasks. Only defined on Android because other