Prototype: Use Chromium IPC for plugin LOAD_MODULE.

ppapi/native_client/src/trusted/plugin/plugin.h

Index: ppapi/native_client/src/trusted/plugin/plugin.h
diff --git a/ppapi/native_client/src/trusted/plugin/plugin.h b/ppapi/native_client/src/trusted/plugin/plugin.h
index 038d96d9a55585b2cdf7134d9057648577fbfdb4..5c86674f5d92a9f739c631c30637edc99141bfb4 100644
--- a/ppapi/native_client/src/trusted/plugin/plugin.h
+++ b/ppapi/native_client/src/trusted/plugin/plugin.h
@@ -101,6 +101,11 @@ class Plugin : public pp::InstancePrivate {
                       const pp::CompletionCallback& init_done_cb,
                       const pp::CompletionCallback& crash_cb);
 
+  void LoadNexeOnMainThread(int32_t pp_error,
+                            ServiceRuntime* service_runtime,
+                            nacl::DescWrapper* wrapper,
+                            const pp::CompletionCallback& crash_cb);
+
   // Finish hooking interfaces up, after low-level initialization is
   // complete.
   bool LoadNaClModuleContinuationIntern(ErrorInfo* error_info);
@@ -300,13 +305,11 @@ class Plugin : public pp::InstancePrivate {
 
   // Help load a nacl module, from the file specified in wrapper.
   // This will fully initialize the |subprocess| if the load was successful.
-  bool LoadNaClModuleCommon(nacl::DescWrapper* wrapper,
-                            NaClSubprocess* subprocess,
-                            const Manifest* manifest,
-                            bool should_report_uma,
-                            const SelLdrStartParams& params,
-                            const pp::CompletionCallback& init_done_cb,
-                            const pp::CompletionCallback& crash_cb);
+  bool LoadNaClModuleFromBackgroundThread(
+      nacl::DescWrapper* wrapper,
+      NaClSubprocess* subprocess,
+      const Manifest* manifest,
+      const SelLdrStartParams& params);
 
   // Start sel_ldr from the main thread, given the start params.
   // Sets |success| to true on success.
@@ -314,7 +317,9 @@ class Plugin : public pp::InstancePrivate {
   void StartSelLdrOnMainThread(int32_t pp_error,
                                ServiceRuntime* service_runtime,
                                const SelLdrStartParams& params,
-                               bool* success);
+                               PP_CompletionCallback callback);
+
+  void SignalStartSelLdrDone(int32_t pp_error, ServiceRuntime* service_runtime);
 
   // Callback used when getting the URL for the .nexe file.  If the URL loading
   // is successful, the file descriptor is opened and can be passed to sel_ldr
@@ -406,6 +411,7 @@ class Plugin : public pp::InstancePrivate {
   nacl::string manifest_url_;
   ReadyState nacl_ready_state_;
   bool nexe_error_reported_;  // error or crash reported
+  bool start_sel_ldr_success_;
 
   nacl::DescWrapperFactory* wrapper_factory_;