PPAPI: Make blocking completion callbacks work.

ppapi/shared_impl/tracked_callback_unittest.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 "base/memory/ref_counted.h"
 #include "base/message_loop.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/shared_impl/callback_tracker.h"
 #include "ppapi/shared_impl/resource.h"
@@ skipping 36 matching lines @@
 
 void TestCallback(void* user_data, int32_t result) {
   CallbackRunInfo* info = reinterpret_cast<CallbackRunInfo*>(user_data);
   info->run_count++;
   if (info->run_count == 1)
     info->result = result;
 }
 
 }  // namespace
 
+// BlockingCallbackTest --------------------------------------------------------
+
+// Tests that blocking callbacks work properly.
+/*
+TEST_F(TrackedCallbackTest, blah) {
+}
+*/
+
 // CallbackShutdownTest --------------------------------------------------------
 
 namespace {
 
 class CallbackShutdownTest : public TrackedCallbackTest {
  public:
   CallbackShutdownTest() {}
 
   // Cases:
   // (1) A callback which is run (so shouldn't be aborted on shutdown).
@@ skipping 191 matching lines @@
   // Unref it again and do the same.
   resource_tracker->ReleaseResource(new_resource_id);
   MessageLoop::current()->RunAllPending();
   resource->CheckFinalState();
 
   // This shouldn't be needed, but make sure there are no stranded tasks.
   MessageLoop::current()->RunAllPending();
 }
 
 }  // namespace ppapi