PPAPI: Make CompletionCallbacks work right on background threads.

ppapi/proxy/ppb_message_loop_proxy.h

 // 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.
 
 #ifndef PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
 #define PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "ppapi/proxy/interface_proxy.h"
-#include "ppapi/shared_impl/resource.h"
+#include "ppapi/shared_impl/ppb_message_loop_shared.h"
 #include "ppapi/thunk/ppb_message_loop_api.h"
 
 struct PPB_MessageLoop_Dev_0_1;
 
 namespace ppapi {
 namespace proxy {
 
-class MessageLoopResource : public Resource, public thunk::PPB_MessageLoop_API {
+class MessageLoopResource : public MessageLoopShared {
  public:
   explicit MessageLoopResource(PP_Instance instance);
   // Construct the one MessageLoopResource for the main thread. This must be
   // invoked on the main thread.
-  struct ForMainThread {};
-  MessageLoopResource(ForMainThread);
+  explicit MessageLoopResource(ForMainThread);
   virtual ~MessageLoopResource();
 
   // Resource overrides.
   virtual thunk::PPB_MessageLoop_API* AsPPB_MessageLoop_API() OVERRIDE;
 
   // PPB_MessageLoop_API implementation.
   virtual int32_t AttachToCurrentThread() OVERRIDE;
   virtual int32_t Run() OVERRIDE;
   virtual int32_t PostWork(PP_CompletionCallback callback,
                            int64_t delay_ms) OVERRIDE;
   virtual int32_t PostQuit(PP_Bool should_destroy) OVERRIDE;
 
+  static MessageLoopResource* GetCurrent();
   void DetachFromThread();
   bool is_main_thread_loop() const {
     return is_main_thread_loop_;
   }
 
  private:
   struct TaskInfo {
     tracked_objects::Location from_here;
     base::Closure closure;
     int64 delay_ms;
   };
 
   // Returns true if the object is associated with the current thread.
   bool IsCurrent() const;
 
   // Handles posting to the message loop if there is one, or the pending queue
   // if there isn't.
   // NOTE: The given closure will be run *WITHOUT* acquiring the Proxy lock.
   //       This only makes sense for user code and completely thread-safe
   //       proxy operations (e.g., MessageLoop::QuitClosure).
-  void PostClosure(const tracked_objects::Location& from_here,
-                   const base::Closure& closure,
-                   int64 delay_ms);
+  virtual void PostClosure(const tracked_objects::Location& from_here,
+                           const base::Closure& closure,
+                           int64 delay_ms) OVERRIDE;
 
   // TLS destructor function.
   static void ReleaseMessageLoop(void* value);
 
   // Created when we attach to the current thread, since MessageLoop assumes
   // that it's created on the thread it will run on. NULL for the main thread
   // loop, since that's owned by somebody else. This is needed for Run and Quit.
   // Any time we post tasks, we should post them using loop_proxy_.
   scoped_ptr<MessageLoop> loop_;
   scoped_refptr<base::MessageLoopProxy> loop_proxy_;
@@ skipping 27 matching lines @@
   static const PPB_MessageLoop_Dev_0_1* GetInterface();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PPB_MessageLoop_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_MESSAGE_LOOP_PROXY_H_