Add an IPC channel between the NaCl loader process and the renderer.

ppapi/native_client/src/trusted/plugin/plugin.cc

Index: ppapi/native_client/src/trusted/plugin/plugin.cc
===================================================================
--- ppapi/native_client/src/trusted/plugin/plugin.cc	(revision 143163)
+++ ppapi/native_client/src/trusted/plugin/plugin.cc	(working copy)
@@ -34,6 +34,7 @@
 #include "native_client/src/trusted/desc/nacl_desc_wrapper.h"
 #include "native_client/src/trusted/nonnacl_util/sel_ldr_launcher.h"
 #include "native_client/src/trusted/plugin/json_manifest.h"
+#include "native_client/src/trusted/plugin/nacl_entry_points.h"
 #include "native_client/src/trusted/plugin/nacl_subprocess.h"
 #include "native_client/src/trusted/plugin/nexe_arch.h"
 #include "native_client/src/trusted/plugin/plugin_error.h"
@@ -609,6 +610,12 @@
   if (!service_runtime_started) {
     return false;
   }
+  if (start_ppapi_proxy && start_ppapi_proxy(pp_instance())) {
+    using_ipc_proxy_ = true;
+    CHECK(init_done_cb.pp_completion_callback().func != NULL);
+    PLUGIN_PRINTF(("Plugin::LoadNaClModuleCommon, started ipc proxy.\n"));
+    pp::Module::Get()->core()->CallOnMainThread(0, init_done_cb, PP_OK);

[dmichael (off chromium), 2012/06/21 18:18:16]

We probably ought to comment to explain this too...  I think normally the
init_done_cb gets invoked as a result of receiving a response from
StartJSObjectProxy (maybe...  I've forgotten since I traced through it). In the
IPC proxy case, we don't invoke that, so we explicitly schedule it here.

[bbudge, 2012/06/21 19:28:18]

Done.

+  }
   return true;
 }
 
@@ -631,6 +638,11 @@
 }
 
 bool Plugin::LoadNaClModuleContinuationIntern(ErrorInfo* error_info) {
+  // If we are using the IPC proxy, StartSrpcServices and StartJSObjectProxy
+  // don't makes sense. Return 'true' so that the plugin continues loading.
+  if (using_ipc_proxy_)
+    return true;
+
   if (!main_subprocess_.StartSrpcServices()) {
     error_info->SetReport(ERROR_SRPC_CONNECTION_FAIL,
                           "SRPC connection failure for " +
@@ -862,7 +874,8 @@
       init_time_(0),
       ready_time_(0),
       nexe_size_(0),
-      time_of_last_progress_event_(0) {
+      time_of_last_progress_event_(0),
+      using_ipc_proxy_(false) {
   PLUGIN_PRINTF(("Plugin::Plugin (this=%p, pp_instance=%"
                  NACL_PRId32")\n", static_cast<void*>(this), pp_instance));
   callback_factory_.Initialize(this);