Make chrome/browser/media_galleries compile on Android

This is to allow compiling Chrome for Android with use_aura=1.

BUG=507792

Review URL: https://codereview.chromium.org/1467373002

Cr-Commit-Position: refs/heads/master@{#361273}

chrome/browser/media_galleries/android/mtp_device_delegate_impl_android.cc

+// Copyright 2015 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/media_galleries/fileapi/mtp_device_async_delegate.h"
+
+void CreateMTPDeviceAsyncDelegate(
+    const std::string& device_location,
+    const bool read_only,
+    const CreateMTPDeviceAsyncDelegateCallback& callback) {
+  // Return nullptr as there is no MTPDeviceAsyncDelegate implementation for
+  // Chrome on Android at the moment.
+  // TODO(crbug.com/560390): Add an MTPDeviceAsyncDelegate implementation on
+  // Android.
+  NOTIMPLEMENTED();
+  callback.Run(nullptr);
+}

chrome/browser/media_galleries/media_folder_finder.cc

@@ -56,6 +56,9 @@ const int kPrunedPaths[] = {
 #if defined(OS_WIN) || defined(OS_LINUX)
   base::DIR_TEMP,
 #endif
+#if defined(OS_ANDROID)
+  base::DIR_ANDROID_APP_DATA,
+#endif
 };
 
 bool IsValidScanPath(const base::FilePath& path) {

chrome/chrome_browser.gypi

@@ -1144,6 +1144,7 @@
       'browser/importer/profile_writer.h',
       'browser/lifetime/browser_close_manager.cc',
       'browser/lifetime/browser_close_manager.h',
+      'browser/media_galleries/android/mtp_device_delegate_impl_android.cc',
       'browser/media_galleries/fileapi/av_scanning_file_validator.cc',
       'browser/media_galleries/fileapi/av_scanning_file_validator.h',
       'browser/media_galleries/fileapi/device_media_async_file_util.cc',