Support cross-profile copy between Chrome OS Google Drive folders.

chrome/browser/chromeos/drive/fileapi/fileapi_worker.cc

Index: chrome/browser/chromeos/drive/fileapi/fileapi_worker.cc
diff --git a/chrome/browser/chromeos/drive/fileapi/fileapi_worker.cc b/chrome/browser/chromeos/drive/fileapi/fileapi_worker.cc
index e20ac0cafe1aff3a92319a60add039be4b642c71..7cc9ebcf3cbe7d3239a43d090ae6cc16b71d00ea 100644
--- a/chrome/browser/chromeos/drive/fileapi/fileapi_worker.cc
+++ b/chrome/browser/chromeos/drive/fileapi/fileapi_worker.cc
@@ -14,6 +14,7 @@
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/drive/resource_entry_conversion.h"
 #include "content/public/browser/browser_thread.h"
+#include "webkit/browser/fileapi/file_system_url.h"
 #include "webkit/common/fileapi/directory_entry.h"
 
 using content::BrowserThread;
@@ -197,6 +198,13 @@ void OpenFileAfterFileSystemOpenFile(int file_flags,
 
 }  // namespace
 
+FileSystemInterface* GetFileSystemFromUrl(const fileapi::FileSystemURL& url) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  Profile* profile = util::ExtractProfileFromPath(url.path());
+  return profile ? util::GetFileSystemByProfile(profile) : NULL;
+}
+
 void RunFileSystemCallback(
     const FileSystemGetter& file_system_getter,
     const base::Callback<void(FileSystemInterface*)>& callback,