mash: Exit the root process if the window manager service crashes

chrome/app/mash/mash_runner.h

Index: chrome/app/mash/mash_runner.h
diff --git a/chrome/app/mash/mash_runner.h b/chrome/app/mash/mash_runner.h
index deaea41a5765d69747d29483559d84a3e679dd9f..62fe4196c6e91246d2ff7e45923e446ad822dd2a 100644
--- a/chrome/app/mash/mash_runner.h
+++ b/chrome/app/mash/mash_runner.h
@@ -10,7 +10,12 @@
 #include "base/macros.h"
 #include "services/service_manager/public/interfaces/service.mojom.h"
 
+namespace base {
+class RunLoop;
+}
+
 namespace service_manager {
+class Identity;
 class ServiceContext;
 }
 
@@ -25,7 +30,16 @@ class MashRunner {
   int Run();
 
  private:
-  void RunMain();
+  // Runs the main process, including the service manager. Returns the exit
+  // value for the process.
+  int RunMain();
+
+  // Runs a background service manager in the main process.
+  void RunServiceManagerInMain();
+
+  // Called when a child service exits. The main process may decide to exit in
+  // response.
+  void OnInstanceQuitInMain(const service_manager::Identity& identity);
 
   // Returns 0 if the child process was initialized correctly, or error code on
   // failure.
@@ -33,8 +47,15 @@ class MashRunner {
 
   void StartChildApp(service_manager::mojom::ServiceRequest service_request);
 
+  // Context for service manager in the main process.
   std::unique_ptr<service_manager::ServiceContext> context_;
 
+  // Run loop for the main process.
+  std::unique_ptr<base::RunLoop> main_run_loop_;
+
+  // Return value for the main process.
+  int main_return_value_ = 0;
+
   DISALLOW_COPY_AND_ASSIGN(MashRunner);
 };