PPAPI: Make blocking completion callbacks work.

ppapi/shared_impl/ppapi_globals.cc

 // Copyright (c) 2012 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 "ppapi/shared_impl/ppapi_globals.h"
 
 #include "base/lazy_instance.h"  // For testing purposes only.
 #include "base/logging.h"
+#include "base/message_loop_proxy.h"
 #include "base/threading/thread_local.h"  // For testing purposes only.
 
 namespace ppapi {
 
 namespace {
 // Thread-local globals for testing. See SetPpapiGlobalsOnThreadForTest for more
 // information.
 base::LazyInstance<base::ThreadLocalPointer<PpapiGlobals> >::Leaky
     tls_ppapi_globals_for_test = LAZY_INSTANCE_INITIALIZER;
 }  // namespace
@@ skipping 15 matching lines @@
 }
 
 // static
 void PpapiGlobals::SetPpapiGlobalsOnThreadForTest(PpapiGlobals* ptr) {
   // If we're using a per-thread PpapiGlobals, we should not have a global one.
   // If we allowed it, it would always over-ride the "test" versions.
   DCHECK(!ppapi_globals_);
   tls_ppapi_globals_for_test.Pointer()->Set(ptr);
 }
 
+base::MessageLoopProxy* PpapiGlobals::GetMainThreadMessageLoop() {
+  CR_DEFINE_STATIC_LOCAL(scoped_refptr<base::MessageLoopProxy>, proxy,
+      (base::MessageLoopProxy::current()));
+  return proxy.get();
+}
+
 bool PpapiGlobals::IsHostGlobals() const {
   return false;
 }
 
 bool PpapiGlobals::IsPluginGlobals() const {
   return false;
 }
 
 // static
 PpapiGlobals* PpapiGlobals::GetThreadLocalPointer() {
   return tls_ppapi_globals_for_test.Pointer()->Get();
 }
 
 }  // namespace ppapi