PPAPI: Make blocking completion callbacks work.

ppapi/proxy/ppb_instance_proxy.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/proxy/ppb_instance_proxy.h"
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_time.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/ppb_audio_config.h"
@@ skipping 417 matching lines @@
   dispatcher()->Send(new PpapiHostMsg_PPBInstance_SetCursor(
       API_ID_PPB_INSTANCE, instance, static_cast<int32_t>(type),
       image_host_resource, hot_spot ? *hot_spot : PP_MakePoint(0, 0)));
   return PP_TRUE;
 #else  // defined(OS_NACL)
   return PP_FALSE;
 #endif
 }
 
 int32_t PPB_Instance_Proxy::LockMouse(PP_Instance instance,
-                                      PP_CompletionCallback callback) {
-  if (!callback.func)
-    return PP_ERROR_BADARGUMENT;
-
+                                      scoped_refptr<TrackedCallback> callback) {
   // Save the mouse callback on the instance data.
   InstanceData* data = static_cast<PluginDispatcher*>(dispatcher())->
       GetInstanceData(instance);
   if (!data)
     return PP_ERROR_BADARGUMENT;
-  if (data->mouse_lock_callback.func)
+  if (TrackedCallback::IsPending(data->mouse_lock_callback))
     return PP_ERROR_INPROGRESS;  // Already have a pending callback.
   data->mouse_lock_callback = callback;
 
   dispatcher()->Send(new PpapiHostMsg_PPBInstance_LockMouse(
       API_ID_PPB_INSTANCE, instance));
   return PP_OK_COMPLETIONPENDING;
 }
 
 void PPB_Instance_Proxy::UnlockMouse(PP_Instance instance) {
   dispatcher()->Send(new PpapiHostMsg_PPBInstance_UnlockMouse(
@@ skipping 174 matching lines @@
   // Need to be careful to always issue the callback.
   pp::CompletionCallback cb = callback_factory_.NewCallback(
       &PPB_Instance_Proxy::MouseLockCompleteInHost, instance);
 
   EnterInstanceNoLock enter(instance);
   if (enter.failed()) {
     cb.Run(PP_ERROR_BADARGUMENT);
     return;
   }
   int32_t result = enter.functions()->LockMouse(instance,
-                                                cb.pp_completion_callback());
+                                                enter.callback());
   if (result != PP_OK_COMPLETIONPENDING)
     cb.Run(result);
 }
 
 void PPB_Instance_Proxy::OnHostMsgUnlockMouse(PP_Instance instance) {
   EnterInstanceNoLock enter(instance);
   if (enter.succeeded())
     enter.functions()->UnlockMouse(instance);
 }
 
@@ skipping 22 matching lines @@
 }
 
 void PPB_Instance_Proxy::OnHostMsgDocumentCanAccessDocument(PP_Instance active,
                                                             PP_Instance target,
                                                             PP_Bool* result) {
   EnterInstanceNoLock enter(active);
   if (enter.succeeded())
     *result = enter.functions()->DocumentCanAccessDocument(active, target);
 }
 
-void PPB_Instance_Proxy::OnHostMsgGetDocumentURL(PP_Instance instance,
-                                                 SerializedVarReturnValue result) {
+void PPB_Instance_Proxy::OnHostMsgGetDocumentURL(
+    PP_Instance instance,
+    SerializedVarReturnValue result) {
   EnterInstanceNoLock enter(instance);
   if (enter.succeeded()) {
     result.Return(dispatcher(),
                   enter.functions()->GetDocumentURL(instance, NULL));
   }
 }
 
 void PPB_Instance_Proxy::OnHostMsgGetPluginInstanceURL(
     PP_Instance instance,
     SerializedVarReturnValue result) {
@@ skipping 52 matching lines @@
   }
 }
 
 void PPB_Instance_Proxy::OnPluginMsgMouseLockComplete(PP_Instance instance,
                                                       int32_t result) {
   // Save the mouse callback on the instance data.
   InstanceData* data = static_cast<PluginDispatcher*>(dispatcher())->
       GetInstanceData(instance);
   if (!data)
     return;  // Instance was probably deleted.
-  if (!data->mouse_lock_callback.func) {
+  if (TrackedCallback::IsPending(data->mouse_lock_callback)) {
     NOTREACHED();
     return;
   }
-  PP_RunAndClearCompletionCallback(&data->mouse_lock_callback, result);
+  TrackedCallback::ClearAndRun(&(data->mouse_lock_callback), result);
 }
 
 void PPB_Instance_Proxy::MouseLockCompleteInHost(int32_t result,
                                                  PP_Instance instance) {
   dispatcher()->Send(new PpapiMsg_PPBInstance_MouseLockComplete(
       API_ID_PPB_INSTANCE, instance, result));
 }
 
 }  // namespace proxy
 }  // namespace ppapi