Adds a new removable storage provider for imageWriterPrivate on Chrome OS

chromeos/disks/mock_disk_mount_manager.cc

Index: chromeos/disks/mock_disk_mount_manager.cc
diff --git a/chromeos/disks/mock_disk_mount_manager.cc b/chromeos/disks/mock_disk_mount_manager.cc
index 6e21d753f55d5b18367a40c3e2166b800a4857ee..468c770524b8c1efa685219a94fd8aedf6469e8a 100644
--- a/chromeos/disks/mock_disk_mount_manager.cc
+++ b/chromeos/disks/mock_disk_mount_manager.cc
@@ -210,6 +210,24 @@ void MockDiskMountManager::CreateDiskEntryForMountDevice(
   }
 }
 
+void MockDiskMountManager::AddDiskEntry(Disk* disk) {
+  DiskMountManager::DiskMap::iterator it = disks_.find(disk->device_path());
+  if (it == disks_.end()) {
+    disks_.insert(std::make_pair(std::string(disk->device_path()), disk));
+  } else {
+    delete it->second;
+    it->second = disk;
+  }
+}
+
+void MockDiskMountManager::RemoveDiskEntry(Disk* disk) {
+  DiskMountManager::DiskMap::iterator it = disks_.find(disk->device_path());
+  if (it != disks_.end()) {
+    delete it->second;
+    disks_.erase(it);
+  }
+}
+
 void MockDiskMountManager::RemoveDiskEntryForMountDevice(
     const DiskMountManager::MountPointInfo& mount_info) {
   DiskMountManager::DiskMap::iterator it = disks_.find(mount_info.source_path);