Add support for almost-recursive watches in Linux DirectoryWatcher

base/file_util.h

Index: base/file_util.h
diff --git a/base/file_util.h b/base/file_util.h
index 3d072297482ce5a9a9d066ba9ffe0d02d3933f62..a3c9a6e72803fdfe4f82efd7035b7f72787293ac 100644
--- a/base/file_util.h
+++ b/base/file_util.h
@@ -15,6 +15,7 @@
 #elif defined(OS_POSIX)
 #include <fts.h>
 #include <sys/stat.h>
+#include <sys/types.h>
 #endif
 
 #include <stdio.h>
@@ -342,6 +343,11 @@ bool GetFileInfo(const FilePath& file_path, FileInfo* info);
 // Deprecated temporary compatibility function.
 bool GetFileInfo(const std::wstring& file_path, FileInfo* info);
 
+#if defined(OS_POSIX)
+// Store inode number of |path| in |inode|. Return true on success.
+bool GetInode(const FilePath& path, ino_t* inode);
+#endif
+
 // Wrapper for fopen-like calls. Returns non-NULL FILE* on success.
 FILE* OpenFile(const FilePath& filename, const char* mode);
 // Deprecated temporary compatibility functions.