Rename the drive: scheme with the externalfile: scheme.

chrome/browser/chromeos/fileapi/external_file_url_util.cc

+// Copyright 2014 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.
+
+#include "chrome/browser/chromeos/fileapi/external_file_url_util.h"
+
+#include <string>
+
+#include "base/strings/stringprintf.h"
+#include "chrome/browser/chromeos/drive/file_system_util.h"
+#include "chrome/common/url_constants.h"
+#include "content/public/browser/browser_thread.h"
+#include "net/base/escape.h"
+
+using content::BrowserThread;
+
+namespace chromeos {
+
+GURL FilePathToExternalFileURL(const base::FilePath& path) {
+  std::string url(base::StringPrintf(
+      "%s:%s", chrome::kExternalFileScheme, path.AsUTF8Unsafe().c_str()));
+  return GURL(url);
+}
+
+base::FilePath ExternalFileURLToFilePath(const GURL& url) {
+  if (!url.is_valid() || url.scheme() != chrome::kExternalFileScheme)
+    return base::FilePath();
+  std::string path_string =
+      net::UnescapeURLComponent(url.GetContent(), net::UnescapeRule::NORMAL);
+  return base::FilePath::FromUTF8Unsafe(path_string);
+}
+
+void MaybeSetExternalFileURL(Profile* profile,
+                             const base::FilePath& path,
+                             GURL* url) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  if (!drive::util::IsUnderDriveMountPoint(path))

[mtomasz, 2014/09/22 01:58:48]

I'm wondering if we should have a dependency to drive here. This file
responsibility is to create an external file url, right? Maybe we should have
this check just when we call the function? WDYT?

[hirono, 2014/09/22 03:32:19]

I'll update the function at the next patch, but I'll still use the drive related
code there.
https://codereview.chromium.org/589473002/diff/20001/chrome/browser/chromeos/...

Currently the function masks drive hash with 'drive' prefix (e.g.
'filesystem:origin/drive-xxxx/root/test.txt' ->
'externalfile:drive/root/test.txt') as well as the existing drive: scheme. If I
stop this, I can remove the drive related code. Masking drive hash is @kinaba's
suggestion, so let me discuss with him.

[mtomasz, 2014/09/22 05:03:31]

Got it.

+    return;
+
+  drive::FileSystemInterface* file_system =
+      drive::util::GetFileSystemByProfile(profile);
+  if (!file_system)
+    return;
+
+  *url = FilePathToExternalFileURL(drive::util::ExtractDrivePath(path));
+}
+
+}  // namespace chromeos