Make FileSystemWatcher work on MIPS and make watching on android the same as linux.

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 b8aeab47ab5285a191c661379fa645bc56cf400b..4e574463f1b2bb0bc3fc81e6de357118bd5e2275 100644
--- a/runtime/bin/file_system_watcher_linux.cc
+++ b/runtime/bin/file_system_watcher_linux.cc
@@ -10,6 +10,8 @@
 #include <errno.h>  // NOLINT
 #include <sys/inotify.h>  // NOLINT
 
+#include "bin/fdutils.h"
+
 
 namespace dart {
 namespace bin {
@@ -22,8 +24,12 @@ bool FileSystemWatcher::IsSupported() {
 intptr_t FileSystemWatcher::WatchPath(const char* path,
                                       int events,
                                       bool recursive) {
-  int fd = TEMP_FAILURE_RETRY(inotify_init1(IN_NONBLOCK | IN_CLOEXEC));
+  int fd = TEMP_FAILURE_RETRY(inotify_init1(IN_CLOEXEC));
   if (fd < 0) return -1;
+  // Some systems dosn't support setting this as non-blocking. Since watching
+  // internals are kept away from the user, we know it's possible to continue,
+  // even if setting non-blocking fails.
+  FDUtils::SetNonBlocking(fd);
   int list_events = IN_DELETE_SELF | IN_MOVE_SELF;
   if (events & kCreate) list_events |= IN_CREATE;
   if (events & kModifyContent) list_events |= IN_CLOSE_WRITE | IN_ATTRIB;