Wired support for file truncating with RemoteFileSystemOperation::OpenFile() method (case when base…

content/renderer/pepper/pepper_plugin_delegate_impl.cc

Index: content/renderer/pepper/pepper_plugin_delegate_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_delegate_impl.cc b/content/renderer/pepper/pepper_plugin_delegate_impl.cc
index 39401e8849e737bd56ea69648b51cd0e19de3492..8ad3fa9bd90c9e2f99b9d2387e8c91cc29498038 100644
--- a/content/renderer/pepper/pepper_plugin_delegate_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_delegate_impl.cc
@@ -855,8 +855,10 @@ class AsyncOpenFileSystemURLCallbackTranslator
     : public fileapi::FileSystemCallbackDispatcher {
  public:
   AsyncOpenFileSystemURLCallbackTranslator(
-      const webkit::ppapi::PluginDelegate::AsyncOpenFileCallback& callback)
-    : callback_(callback) {
+      const webkit::ppapi::PluginDelegate::AsyncOpenFileCallback& callback,
+      const base::FileUtilProxy::StatusCallback& close_file_callback)
+    : callback_(callback),
+      close_file_callback_(close_file_callback) {
   }
 
   virtual ~AsyncOpenFileSystemURLCallbackTranslator() {}
@@ -895,12 +897,13 @@ class AsyncOpenFileSystemURLCallbackTranslator
     if (file != base::kInvalidPlatformFileValue) {
       base::FileUtilProxy::Close(
           RenderThreadImpl::current()->GetFileThreadMessageLoopProxy(), file,
-          base::FileUtilProxy::StatusCallback());
+          close_file_callback_);
     }
   }
 
 private:  // TODO(ericu): Delete this?
   webkit::ppapi::PluginDelegate::AsyncOpenFileCallback callback_;
+  base::FileUtilProxy::StatusCallback close_file_callback_;
 };
 
 bool PepperPluginDelegateImpl::AsyncOpenFileSystemURL(
@@ -909,7 +912,25 @@ bool PepperPluginDelegateImpl::AsyncOpenFileSystemURL(
   FileSystemDispatcher* file_system_dispatcher =
       ChildThread::current()->file_system_dispatcher();
   return file_system_dispatcher->OpenFile(path, flags,
-      new AsyncOpenFileSystemURLCallbackTranslator(callback));
+      new AsyncOpenFileSystemURLCallbackTranslator(
+          callback, GetCloseFileSystemURLCallback(path)));
+}
+
+base::Callback<void (base::PlatformFileError)>
+PepperPluginDelegateImpl::GetCloseFileSystemURLCallback(const GURL& path) {
+  return base::Bind(&PepperPluginDelegateImpl::DoNotifyFileClosed,
+                    AsWeakPtr(),
+                    path);
+}
+
+void PepperPluginDelegateImpl::DoNotifyFileClosed(
+    const GURL& path, base::PlatformFileError error) {
+  if (error != base::PLATFORM_FILE_OK)
+    return;
+
+  FileSystemDispatcher* file_system_dispatcher =
+      ChildThread::current()->file_system_dispatcher();
+  file_system_dispatcher->NotifyFileClosed(path);
 }
 
 base::PlatformFileError PepperPluginDelegateImpl::OpenFile(