PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_video_capture_thunk.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/c/pp_errors.h"
 #include "ppapi/shared_impl/ppb_device_ref_shared.h"
+#include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_device_ref_api.h"
 #include "ppapi/thunk/ppb_video_capture_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
 #include "ppapi/thunk/thunk.h"
 
 namespace ppapi {
 namespace thunk {
 
 namespace {
@@ skipping 12 matching lines @@
   return PP_FromBool(enter.succeeded());
 }
 
 int32_t EnumerateDevices(PP_Resource video_capture,
                          PP_Resource* devices,
                          PP_CompletionCallback callback) {
   EnterVideoCapture enter(video_capture, callback, true);
   if (enter.failed())
     return enter.retval();
 
-  return enter.SetResult(enter.object()->EnumerateDevices(devices, callback));
+  return enter.SetResult(enter.object()->EnumerateDevices(devices,
+                                                          enter.callback()));
 }
 
 int32_t Open(PP_Resource video_capture,
              PP_Resource device_ref,
              const PP_VideoCaptureDeviceInfo_Dev* requested_info,
              uint32_t buffer_count,
              PP_CompletionCallback callback) {
   EnterVideoCapture enter(video_capture, callback, true);
   if (enter.failed())
     return enter.retval();
 
   std::string device_id;
   // |device_id| remains empty if |device_ref| is 0, which means the default
   // device.
   if (device_ref != 0) {
     EnterResourceNoLock<PPB_DeviceRef_API> enter_device_ref(device_ref, true);
     if (enter_device_ref.failed())
       return enter.SetResult(PP_ERROR_BADRESOURCE);
     device_id = enter_device_ref.object()->GetDeviceRefData().id;
   }
 
   return enter.SetResult(enter.object()->Open(
-      device_id, *requested_info, buffer_count, callback));
+      device_id, *requested_info, buffer_count, enter.callback()));
 }
 
 int32_t StartCapture(PP_Resource video_capture) {
   EnterVideoCapture enter(video_capture, true);
   if (enter.failed())
     return enter.retval();
   return enter.object()->StartCapture();
 }
 
 int32_t ReuseBuffer(PP_Resource video_capture,
@@ skipping 51 matching lines @@
 const PPB_VideoCapture_Dev_0_1* GetPPB_VideoCapture_Dev_0_1_Thunk() {
   return &g_ppb_video_capture_0_1_thunk;
 }
 
 const PPB_VideoCapture_Dev_0_2* GetPPB_VideoCapture_Dev_0_2_Thunk() {
   return &g_ppb_video_capture_0_2_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi