[dart:io] Namespaces for file IO

runtime/bin/file_system_watcher_linux.cc

Index: runtime/bin/file_system_watcher_linux.cc
diff --git a/runtime/bin/file_system_watcher_linux.cc b/runtime/bin/file_system_watcher_linux.cc
index bd9806ed9f766fa8ee9b5d050eae4ece628a3470..a0387c0e653c13c7144058609edf398d3ad0e598 100644
--- a/runtime/bin/file_system_watcher_linux.cc
+++ b/runtime/bin/file_system_watcher_linux.cc
@@ -11,6 +11,7 @@
 #include <sys/inotify.h>  // NOLINT
 
 #include "bin/fdutils.h"
+#include "bin/file.h"
 #include "bin/socket.h"
 #include "platform/signal_blocker.h"
 
@@ -38,6 +39,7 @@ void FileSystemWatcher::Close(intptr_t id) {
 }
 
 intptr_t FileSystemWatcher::WatchPath(intptr_t id,
+                                      Namespace* namespc,
                                       const char* path,
                                       int events,
                                       bool recursive) {
@@ -54,6 +56,8 @@ intptr_t FileSystemWatcher::WatchPath(intptr_t id,
   if ((events & kMove) != 0) {
     list_events |= IN_MOVE;
   }
+  const char* resolved_path = File::GetCanonicalPath(namespc, path);
+  path = resolved_path != NULL ? resolved_path : path;
   int path_id = NO_RETRY_EXPECTED(inotify_add_watch(id, path, list_events));
   if (path_id < 0) {
     return -1;