platform_util::OpenItem fixes

chrome/browser/platform_util_win.cc

Index: chrome/browser/platform_util_win.cc
===================================================================
--- chrome/browser/platform_util_win.cc	(revision 108523)
+++ chrome/browser/platform_util_win.cc	(working copy)
@@ -9,6 +9,7 @@
 #include <shellapi.h>
 #include <shlobj.h>
 
+#include "base/bind.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
@@ -17,13 +18,17 @@
 #include "base/win/registry.h"
 #include "base/win/scoped_co_mem.h"
 #include "base/win/scoped_comptr.h"
+#include "content/public/browser/browser_thread.h"
 #include "googleurl/src/gurl.h"
 #include "ui/base/win/shell.h"
 #include "ui/gfx/native_widget_types.h"
 
+using content::BrowserThread;
+
 namespace platform_util {
 
 void ShowItemInFolder(const FilePath& full_path) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   FilePath dir = full_path.DirName();
   // ParseDisplayName will fail if the directory is "C:", it must be "C:\\".
   if (dir.value() == L"" || !file_util::EnsureEndsWithSeparator(&dir))
@@ -108,6 +113,13 @@
 }
 
 void OpenItem(const FilePath& full_path) {
+  if (!BrowserThread::CurrentlyOn(BrowserThread::FILE)) {
+    BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
+                            base::Bind(&OpenItem, full_path));
+    return;
+  }
+
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   ui::win::OpenItemViaShell(full_path);
 }