Move the rest of the Flash functions to the thunk system.

ppapi/proxy/ppb_flash_proxy.cc

Index: ppapi/proxy/ppb_flash_proxy.cc
diff --git a/ppapi/proxy/ppb_flash_proxy.cc b/ppapi/proxy/ppb_flash_proxy.cc
index 9c91830f36604a6b11ac88cfe56d7995224d1b2a..3db3dabdfcfe06a467d646f9392478b9fb71ff44 100644
--- a/ppapi/proxy/ppb_flash_proxy.cc
+++ b/ppapi/proxy/ppb_flash_proxy.cc
@@ -4,9 +4,15 @@
 
 #include "ppapi/proxy/ppb_flash_proxy.h"
 
+#include <map>
+#include <set>
+
 #include "base/logging.h"
+#include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
+#include "base/synchronization/lock.h"
 #include "base/time.h"
+#include "ipc/ipc_channel_proxy.h"
 #include "ppapi/c/dev/ppb_font_dev.h"
 #include "ppapi/c/dev/ppb_var_deprecated.h"
 #include "ppapi/c/pp_errors.h"
@@ -31,10 +37,337 @@
 #include "ppapi/thunk/resource_creation_api.h"
 
 using ppapi::thunk::EnterInstanceNoLock;
+using ppapi::thunk::EnterResourceNoLock;
 
 namespace ppapi {
 namespace proxy {
 
+namespace {
+
+IPC::PlatformFileForTransit PlatformFileToPlatformFileForTransit(
+    Dispatcher* dispatcher,
+    int32_t* error,
+    base::PlatformFile file) {
+  if (*error != PP_OK)
+    return IPC::InvalidPlatformFileForTransit();
+  IPC::PlatformFileForTransit out_handle =
+      dispatcher->ShareHandleWithRemote(file, true);
+  if (out_handle == IPC::InvalidPlatformFileForTransit())
+    *error = PP_ERROR_NOACCESS;
+  return out_handle;
+}
+
+// ModuleLocalThreadAdapter ----------------------------------------------------
+// TODO(yzshen): Refactor to use IPC::SyncMessageFilter.
+class ModuleLocalThreadAdapter
+    : public base::RefCountedThreadSafe<ModuleLocalThreadAdapter> {
+  class Filter;
+ public:
+  ModuleLocalThreadAdapter();
+
+  void AddInstanceRouting(PP_Instance instance, Dispatcher* dispatcher);
+  void ClearInstanceRouting(PP_Instance instance);
+  void ClearFilter(Dispatcher* dispatcher, Filter* filter);
+
+  bool OnModuleLocalMessageReceived(const IPC::Message& msg);
+
+  // Called on the I/O thread when the channel is being destroyed and the
+  // given message will never be issued a reply.
+  void OnModuleLocalMessageFailed(int message_id);
+
+  bool Send(PP_Instance instance, IPC::Message* msg);
+
+ private:
+  class Filter : public IPC::ChannelProxy::MessageFilter {
+   public:
+    explicit Filter(Dispatcher* dispatcher);
+    ~Filter();
+
+    void Send(IPC::Message* msg);
+
+    virtual void OnFilterAdded(IPC::Channel* channel);
+    virtual void OnFilterRemoved();
+    virtual bool OnMessageReceived(const IPC::Message& message);
+
+   private:
+    // DO NOT DEREFERENCE! This is used only for tracking.
+    Dispatcher* dispatcher_;
+
+    IPC::Channel* channel_;
+
+    // Holds the IPC messages that were sent before the channel was connected.
+    // These will be sent ASAP.
+    std::vector<IPC::Message*> pre_connect_pending_messages_;
+
+    // Holds the IDs of the sync messages we're currently waiting on for this
+    // channel. This tracking allows us to cancel those requests if the
+    // remote process crashes and we're cleaning up this filter (without just
+    // deadlocking the waiting thread(s).
+    std::set<int> pending_requests_for_filter_;
+  };
+
+  void SendFromIOThread(Dispatcher* dispatcher, IPC::Message* msg);
+
+  // Internal version of OnModuleLocalMessageFailed which assumes the lock
+  // is already held.
+  void OnModuleLocalMessageFailedLocked(int message_id);
+
+  base::Lock lock_;
+
+  scoped_refptr<base::MessageLoopProxy> main_thread_;
+
+  // Will be NULL before an instance routing is added.
+  scoped_refptr<base::MessageLoopProxy> io_thread_;
+
+  typedef std::map<PP_Instance, Dispatcher*> InstanceToDispatcher;
+  InstanceToDispatcher instance_to_dispatcher_;
+
+  // The filters are owned by the channel.
+  typedef std::map<Dispatcher*, Filter*> DispatcherToFilter;
+  DispatcherToFilter dispatcher_to_filter_;
+
+  // Tracks all messages with currently waiting threads. This does not own
+  // the pointer, the pointer lifetime is managed by Send().
+  typedef std::map<int, IPC::PendingSyncMsg*> SyncRequestMap;
+  SyncRequestMap pending_sync_requests_;
+};
+
+ModuleLocalThreadAdapter* g_module_local_thread_adapter = NULL;
+
+ModuleLocalThreadAdapter::Filter::Filter(Dispatcher* dispatcher)
+    : dispatcher_(dispatcher), channel_(NULL) {
+}
+
+ModuleLocalThreadAdapter::Filter::~Filter() {
+}
+
+void ModuleLocalThreadAdapter::Filter::Send(IPC::Message* msg) {
+  if (channel_) {
+    int message_id = IPC::SyncMessage::GetMessageId(*msg);
+    if (channel_->Send(msg))
+      pending_requests_for_filter_.insert(message_id);
+    else  // Message lost, notify adapter so it can unblock.
+      g_module_local_thread_adapter->OnModuleLocalMessageFailed(message_id);
+  } else {
+    // No channel, save this message for when it's connected.
+    pre_connect_pending_messages_.push_back(msg);
+  }
+}
+
+void ModuleLocalThreadAdapter::Filter::OnFilterAdded(IPC::Channel* channel) {
+  DCHECK(!channel_);
+  channel_ = channel;
+
+  // Now that we have a channel, process all pending messages.
+  for (size_t i = 0; i < pre_connect_pending_messages_.size(); i++)
+    Send(pre_connect_pending_messages_[i]);
+  pre_connect_pending_messages_.clear();
+}
+
+void ModuleLocalThreadAdapter::Filter::OnFilterRemoved() {
+  DCHECK(channel_);
+  channel_ = NULL;
+  g_module_local_thread_adapter->ClearFilter(dispatcher_, this);
+
+  for (std::set<int>::iterator i = pending_requests_for_filter_.begin();
+       i != pending_requests_for_filter_.end(); ++i) {
+    g_module_local_thread_adapter->OnModuleLocalMessageFailed(*i);
+  }
+}
+
+bool ModuleLocalThreadAdapter::Filter::OnMessageReceived(
+    const IPC::Message& message) {
+  if (!message.is_reply() ||
+      message.routing_id() != API_ID_PPB_FLASH)
+    return false;
+
+  if (g_module_local_thread_adapter->OnModuleLocalMessageReceived(message)) {
+    // The message was consumed, this means we can remove the message ID from
+    // the list of messages this channel is waiting on.
+    pending_requests_for_filter_.erase(IPC::SyncMessage::GetMessageId(message));
+    return true;
+  }
+  return false;
+}
+
+ModuleLocalThreadAdapter::ModuleLocalThreadAdapter()
+    : main_thread_(base::MessageLoopProxy::current()) {
+}
+
+void ModuleLocalThreadAdapter::AddInstanceRouting(PP_Instance instance,
+                                                  Dispatcher* dispatcher) {
+  base::AutoLock lock(lock_);
+
+  // Now that we've had contact with a dispatcher, we can set up the IO thread.
+  DCHECK(main_thread_->BelongsToCurrentThread());
+  if (!io_thread_.get())
+    io_thread_ = dispatcher->GetIPCMessageLoop();
+
+  // Set up the instance -> dispatcher routing.
+  DCHECK(instance_to_dispatcher_.find(instance) ==
+         instance_to_dispatcher_.end());
+  instance_to_dispatcher_[instance] = dispatcher;
+
+  DispatcherToFilter::iterator found_filter =
+      dispatcher_to_filter_.find(dispatcher);
+  if (found_filter == dispatcher_to_filter_.end()) {
+    // Need to set up a filter for this dispatcher to intercept the messages.
+    Filter* filter = new Filter(dispatcher);
+    dispatcher_to_filter_[dispatcher] = filter;
+    dispatcher->AddIOThreadMessageFilter(filter);
+  }
+}
+
+void ModuleLocalThreadAdapter::ClearInstanceRouting(PP_Instance instance) {
+  // The dispatcher->filter mapping is cleaned up by ClearFilter which is
+  // initiated by the channel.
+  instance_to_dispatcher_.erase(instance);
+}
+
+void ModuleLocalThreadAdapter::ClearFilter(Dispatcher* dispatcher,
+                                           Filter* filter) {
+  // DANGER! Don't dereference the dispatcher, it's just used to identify
+  // which filter to remove. The dispatcher may not even exist any more.
+  //
+  // Since the dispatcher may be gone, there's a potential for ambiguity if
+  // another one is created on the main thread before this code runs on the
+  // I/O thread. So we check that the filter matches to avoid this rare case.
+  base::AutoLock lock(lock_);
+  if (dispatcher_to_filter_[dispatcher] == filter)
+    dispatcher_to_filter_.erase(dispatcher);
+}
+
+bool ModuleLocalThreadAdapter::OnModuleLocalMessageReceived(
+    const IPC::Message& msg) {
+  base::AutoLock lock(lock_);
+
+  int message_id = IPC::SyncMessage::GetMessageId(msg);
+  SyncRequestMap::iterator found = pending_sync_requests_.find(message_id);
+  if (found == pending_sync_requests_.end()) {
+    // Not waiting for this event. This will happen for sync messages to the
+    // main thread which use the "regular" sync channel code path.
+    return false;
+  }
+
+  IPC::PendingSyncMsg& info = *found->second;
+
+  if (!msg.is_reply_error())
+    info.deserializer->SerializeOutputParameters(msg);
+  info.done_event->Signal();
+  return true;
+}
+
+void ModuleLocalThreadAdapter::OnModuleLocalMessageFailed(int message_id) {
+  base::AutoLock lock(lock_);
+  OnModuleLocalMessageFailedLocked(message_id);
+}
+
+bool ModuleLocalThreadAdapter::Send(PP_Instance instance, IPC::Message* msg) {
+  // Compute the dispatcher corresponding to this message.
+  Dispatcher* dispatcher = NULL;
+  {
+    base::AutoLock lock(lock_);
+    InstanceToDispatcher::iterator found =
+        instance_to_dispatcher_.find(instance);
+    if (found == instance_to_dispatcher_.end()) {
+      NOTREACHED();
+      delete msg;
+      return false;
+    }
+    dispatcher = found->second;
+  }
+
+  if (main_thread_->BelongsToCurrentThread()) {
+    // Easy case: We're on the same thread as the dispatcher, so we don't need
+    // a lock to access it, and we can just use the normal sync channel stuff
+    // to handle the message. Actually, we MUST use the normal sync channel
+    // stuff since there may be incoming sync messages that need processing.
+    // The code below doesn't handle any nested message loops.
+    return dispatcher->Send(msg);
+  }
+
+  // Background thread case
+  // ----------------------
+  //  1. Generate tracking info, stick in pending_sync_messages_map.
+  //  2. Kick off the request. This is done on the I/O thread.
+  //  3. Filter on the I/O thread notices reply, writes the reply data and
+  //     signals the event. We block on the event while this is happening.
+  //  4. Remove tracking info.
+
+  // Generate the tracking info. and copied
+  IPC::SyncMessage* sync_msg = static_cast<IPC::SyncMessage*>(msg);
+  int message_id = IPC::SyncMessage::GetMessageId(*sync_msg);
+  base::WaitableEvent event(true, false);
+  scoped_ptr<IPC::MessageReplyDeserializer> deserializer(
+      sync_msg->GetReplyDeserializer());  // We own this pointer once retrieved.
+  IPC::PendingSyncMsg info(message_id, deserializer.get(), &event);
+
+  // Add the tracking information to our map.
+  {
+    base::AutoLock lock(lock_);
+    pending_sync_requests_[message_id] = &info;
+  }
+
+  // This is a bit dangerous. We use the dispatcher pointer as the routing
+  // ID for this message. While we don't dereference it, there is an
+  // exceedingly remote possibility that while this is going to the background
+  // thread the connection will be shut down and a new one will be created with
+  // a dispatcher at the same address. It could potentially get sent to a
+  // random place, but it should actually still work (since the Flash file
+  // operations are global).
+  io_thread_->PostTask(FROM_HERE,
+      base::Bind(&ModuleLocalThreadAdapter::SendFromIOThread, this,
+                 dispatcher, msg));
+
+  // Now we block the current thread waiting for the reply.
+  event.Wait();
+
+  {
+    // Clear our tracking info for this message now that we're done.
+    base::AutoLock lock(lock_);
+    DCHECK(pending_sync_requests_.find(message_id) !=
+           pending_sync_requests_.end());
+    pending_sync_requests_.erase(message_id);
+  }
+
+  return true;
+}
+
+void ModuleLocalThreadAdapter::SendFromIOThread(Dispatcher* dispatcher,
+                                                IPC::Message* msg) {
+  // DO NOT DEREFERENCE DISPATCHER. Used as a lookup only.
+  base::AutoLock lock(lock_);
+  DispatcherToFilter::iterator found = dispatcher_to_filter_.find(dispatcher);
+
+  // The dispatcher could have been destroyed by the time we got here since
+  // we're on another thread. Need to unblock the caller.
+  if (found == dispatcher_to_filter_.end()) {
+    OnModuleLocalMessageFailedLocked(IPC::SyncMessage::GetMessageId(*msg));
+    delete msg;
+    return;
+  }
+
+  // Takes ownership of pointer.
+  found->second->Send(msg);
+}
+
+void ModuleLocalThreadAdapter::OnModuleLocalMessageFailedLocked(
+    int message_id) {
+  lock_.AssertAcquired();
+
+  // Unblock the thread waiting for the message that will never come.
+  SyncRequestMap::iterator found = pending_sync_requests_.find(message_id);
+  if (found == pending_sync_requests_.end()) {
+    NOTREACHED();
+    return;
+  }
+  found->second->done_event->Signal();
+}
+
+}  // namespace
+
+// -----------------------------------------------------------------------------
+
 PPB_Flash_Proxy::PPB_Flash_Proxy(Dispatcher* dispatcher)
     : InterfaceProxy(dispatcher) {
 }
@@ -75,6 +408,22 @@ bool PPB_Flash_Proxy::OnMessageReceived(const IPC::Message& msg) {
                         OnHostMsgReadClipboardData)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_WriteClipboardData,
                         OnHostMsgWriteClipboardData)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_OpenFile,
+                        OnHostMsgOpenFile)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_RenameFile,
+                        OnHostMsgRenameFile)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_DeleteFileOrDir,
+                        OnHostMsgDeleteFileOrDir)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_CreateDir,
+                        OnHostMsgCreateDir)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_QueryFile,
+                        OnHostMsgQueryFile)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_GetDirContents,
+                        OnHostMsgGetDirContents)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_OpenFileRef,
+                        OnHostMsgOpenFileRef)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFlash_QueryFileRef,
+                        OnHostMsgQueryFileRef)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   // TODO(brettw) handle bad messages!
@@ -268,6 +617,155 @@ int32_t PPB_Flash_Proxy::WriteClipboardData(
   return PP_OK;
 }
 
+bool PPB_Flash_Proxy::CreateThreadAdapterForInstance(PP_Instance instance) {
+  if (!g_module_local_thread_adapter) {
+    g_module_local_thread_adapter = new ModuleLocalThreadAdapter();
+    g_module_local_thread_adapter->AddRef();  // Leaked, this object is global.
+  }
+
+  PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
+  if (!dispatcher) {
+    NOTREACHED();
+    return false;
+  }
+  g_module_local_thread_adapter->AddInstanceRouting(instance, dispatcher);
+  return true;
+}
+
+void PPB_Flash_Proxy::ClearThreadAdapterForInstance(PP_Instance instance) {
+  if (g_module_local_thread_adapter)
+    g_module_local_thread_adapter->ClearInstanceRouting(instance);
+}
+
+int32_t PPB_Flash_Proxy::OpenFile(PP_Instance instance,
+                                  const char* path,
+                                  int32_t mode,
+                                  PP_FileHandle* file) {
+  if (!g_module_local_thread_adapter)
+    return PP_ERROR_FAILED;
+
+  int32_t result = PP_ERROR_FAILED;
+  IPC::PlatformFileForTransit transit;
+  g_module_local_thread_adapter->Send(instance,
+      new PpapiHostMsg_PPBFlash_OpenFile(
+          API_ID_PPB_FLASH, instance, path, mode, &transit, &result));
+  *file = IPC::PlatformFileForTransitToPlatformFile(transit);
+  return result;
+}
+
+int32_t PPB_Flash_Proxy::RenameFile(PP_Instance instance,
+                                    const char* path_from,
+                                    const char* path_to) {
+  if (!g_module_local_thread_adapter)
+    return PP_ERROR_FAILED;
+
+  int32_t result = PP_ERROR_FAILED;
+  g_module_local_thread_adapter->Send(instance,
+      new PpapiHostMsg_PPBFlash_RenameFile(
+          API_ID_PPB_FLASH, instance, path_from, path_to, &result));
+  return result;
+}
+
+int32_t PPB_Flash_Proxy::DeleteFileOrDir(PP_Instance instance,
+                                         const char* path,
+                                         PP_Bool recursive) {
+  if (!g_module_local_thread_adapter)
+    return PP_ERROR_FAILED;
+
+  int32_t result = PP_ERROR_FAILED;
+  g_module_local_thread_adapter->Send(instance,
+      new PpapiHostMsg_PPBFlash_DeleteFileOrDir(
+          API_ID_PPB_FLASH, instance, path, recursive, &result));
+  return result;
+}
+
+int32_t PPB_Flash_Proxy::CreateDir(PP_Instance instance, const char* path) {
+  if (!g_module_local_thread_adapter)
+    return PP_ERROR_FAILED;
+
+  int32_t result = PP_ERROR_FAILED;
+  g_module_local_thread_adapter->Send(instance,
+      new PpapiHostMsg_PPBFlash_CreateDir(
+          API_ID_PPB_FLASH, instance, path, &result));
+  return result;
+}
+
+int32_t PPB_Flash_Proxy::QueryFile(PP_Instance instance,
+                                   const char* path,
+                                   PP_FileInfo* info) {
+  if (!g_module_local_thread_adapter)
+    return PP_ERROR_FAILED;
+
+  int32_t result = PP_ERROR_FAILED;
+  g_module_local_thread_adapter->Send(instance,
+      new PpapiHostMsg_PPBFlash_QueryFile(
+          API_ID_PPB_FLASH, instance, path, info, &result));
+  return result;
+}
+
+int32_t PPB_Flash_Proxy::GetDirContents(PP_Instance instance,
+                                        const char* path,
+                                        PP_DirContents_Dev** contents) {
+  if (!g_module_local_thread_adapter)
+    return PP_ERROR_FAILED;
+
+  int32_t result = PP_ERROR_FAILED;
+  std::vector<SerializedDirEntry> entries;
+  g_module_local_thread_adapter->Send(instance,
+      new PpapiHostMsg_PPBFlash_GetDirContents(
+          API_ID_PPB_FLASH, instance, path, &entries, &result));
+
+  if (result != PP_OK)
+    return result;
+
+  // Copy the serialized dir entries to the output struct.
+  *contents = new PP_DirContents_Dev;
+  (*contents)->count = static_cast<int32_t>(entries.size());
+  (*contents)->entries = new PP_DirEntry_Dev[entries.size()];
+  for (size_t i = 0; i < entries.size(); i++) {
+    const SerializedDirEntry& source = entries[i];
+    PP_DirEntry_Dev* dest = &(*contents)->entries[i];
+
+    char* name_copy = new char[source.name.size() + 1];
+    memcpy(name_copy, source.name.c_str(), source.name.size() + 1);
+    dest->name = name_copy;
+    dest->is_dir = PP_FromBool(source.is_dir);
+  }
+
+  return result;
+}
+
+int32_t PPB_Flash_Proxy::OpenFileRef(PP_Instance instance,
+                                     PP_Resource file_ref_id,
+                                     int32_t mode,
+                                     PP_FileHandle* file) {
+  EnterResourceNoLock<PPB_FileRef> enter(file_ref_id, true);
+  if (enter.failed())
+    return PP_ERROR_BADRESOURCE;
+
+  int32_t result = PP_ERROR_FAILED;
+  IPC::PlatformFileForTransit transit;
+  dispatcher()->Send(new PpapiHostMsg_PPBFlash_OpenFileRef(
+      API_ID_PPB_FLASH, instance, enter.resource()->host_resource(), mode,
+      &transit, &result));
+  *file = IPC::PlatformFileForTransitToPlatformFile(transit);
+  return result;
+}
+
+int32_t PPB_Flash_Proxy::QueryFileRef(PP_Instance instance,
+                                      PP_Resource file_ref_id,
+                                      PP_FileInfo* info) {
+  EnterResourceNoLock<PPB_FileRef> enter(file_ref_id, true);
+  if (enter.failed())
+    return PP_ERROR_BADRESOURCE;
+
+  int32_t result = PP_ERROR_FAILED;
+  dispatcher()->Send(new PpapiHostMsg_PPBFlash_QueryFileRef(
+      API_ID_PPB_FLASH, instance, enter.resource()->host_resource(), info,
+      &result));
+  return result;
+}
+
 PP_Bool PPB_Flash_Proxy::FlashIsFullscreen(PP_Instance instance) {
   InstanceData* data = static_cast<PluginDispatcher*>(dispatcher())->
       GetInstanceData(instance);
@@ -500,5 +998,133 @@ void PPB_Flash_Proxy::OnHostMsgWriteClipboardData(
   }
 }
 
+void PPB_Flash_Proxy::OnHostMsgOpenFile(
+    PP_Instance instance,
+    const std::string& path,
+    int32_t mode,
+    IPC::PlatformFileForTransit* file_handle,
+    int32_t* result) {
+  EnterInstanceNoLock enter(instance);
+  if (enter.succeeded()) {
+    base::PlatformFile file;
+    *result = enter.functions()->GetFlashAPI()->OpenFile(
+        instance, path.c_str(), mode, &file);
+    *file_handle = PlatformFileToPlatformFileForTransit(
+        dispatcher(), result, file);
+  } else {
+    *result = PP_ERROR_BADARGUMENT;
+  }
+}
+
+void PPB_Flash_Proxy::OnHostMsgRenameFile(PP_Instance instance,
+                                          const std::string& from_path,
+                                          const std::string& to_path,
+                                          int32_t* result) {
+  EnterInstanceNoLock enter(instance);
+  if (enter.succeeded()) {
+    *result = enter.functions()->GetFlashAPI()->RenameFile(
+        instance, from_path.c_str(), to_path.c_str());
+  } else {
+    *result = PP_ERROR_BADARGUMENT;
+  }
+}
+
+void PPB_Flash_Proxy::OnHostMsgDeleteFileOrDir(PP_Instance instance,
+                                               const std::string& path,
+                                               PP_Bool recursive,
+                                               int32_t* result) {
+  EnterInstanceNoLock enter(instance);
+  if (enter.succeeded()) {
+    *result = enter.functions()->GetFlashAPI()->DeleteFileOrDir(
+        instance, path.c_str(), recursive);
+  } else {
+    *result = PP_ERROR_BADARGUMENT;
+  }
+}
+
+void PPB_Flash_Proxy::OnHostMsgCreateDir(PP_Instance instance,
+                                         const std::string& path,
+                                         int32_t* result) {
+  EnterInstanceNoLock enter(instance);
+  if (enter.succeeded()) {
+    *result = enter.functions()->GetFlashAPI()->CreateDir(
+        instance, path.c_str());
+  } else {
+    *result = PP_ERROR_BADARGUMENT;
+  }
+}
+
+void PPB_Flash_Proxy::OnHostMsgQueryFile(PP_Instance instance,
+                                         const std::string& path,
+                                         PP_FileInfo* info,
+                                         int32_t* result) {
+  EnterInstanceNoLock enter(instance);
+  if (enter.succeeded()) {
+    *result = enter.functions()->GetFlashAPI()->QueryFile(
+        instance, path.c_str(), info);
+  } else {
+    *result = PP_ERROR_BADARGUMENT;
+  }
+}
+
+void PPB_Flash_Proxy::OnHostMsgGetDirContents(
+    PP_Instance instance,
+    const std::string& path,
+    std::vector<SerializedDirEntry>* entries,
+    int32_t* result) {
+  EnterInstanceNoLock enter(instance);
+  if (enter.failed()) {
+    *result = PP_ERROR_BADARGUMENT;
+    return;
+  }
+
+  PP_DirContents_Dev* contents = NULL;
+  *result = enter.functions()->GetFlashAPI()->GetDirContents(
+      instance, path.c_str(), &contents);
+  if (*result != PP_OK)
+    return;
+
+  // Convert the list of entries to the serialized version.
+  entries->resize(contents->count);
+  for (int32_t i = 0; i < contents->count; i++) {
+    (*entries)[i].name.assign(contents->entries[i].name);
+    (*entries)[i].is_dir = PP_ToBool(contents->entries[i].is_dir);
+  }
+  enter.functions()->GetFlashAPI()->FreeDirContents(instance, contents);
+}
+
+void PPB_Flash_Proxy::OnHostMsgOpenFileRef(
+    PP_Instance instance,
+    const HostResource& host_resource,
+    int32_t mode,
+    IPC::PlatformFileForTransit* file_handle,
+    int32_t* result) {
+  EnterInstanceNoLock enter(instance);
+  if (enter.failed()) {
+    *result = PP_ERROR_BADARGUMENT;
+    return;
+  }
+
+  base::PlatformFile file;
+  *result = enter.functions()->GetFlashAPI()->OpenFileRef(
+      instance, host_resource.host_resource(), mode, &file);
+  *file_handle = PlatformFileToPlatformFileForTransit(dispatcher(),
+                                                      result, file);
+}
+
+void PPB_Flash_Proxy::OnHostMsgQueryFileRef(
+    PP_Instance instance,
+    const HostResource& host_resource,
+    PP_FileInfo* info,
+    int32_t* result) {
+  EnterInstanceNoLock enter(instance);
+  if (enter.failed()) {
+    *result = PP_ERROR_BADARGUMENT;
+    return;
+  }
+  *result = enter.functions()->GetFlashAPI()->QueryFileRef(
+      instance, host_resource.host_resource(), info);
+}
+
 }  // namespace proxy
 }  // namespace ppapi