Add FLAG_CAN_DELETE_ON_CLOSE and DeleteOnClose for use on Windows.

base/files/file.h

Index: base/files/file.h
diff --git a/base/files/file.h b/base/files/file.h
index 885e00b95776d1030c503bd03ffdb2222af1f9d4..2b903eec2da504cbe3dea887a30efef28ece305b 100644
--- a/base/files/file.h
+++ b/base/files/file.h
@@ -63,21 +63,21 @@ class BASE_EXPORT File {
   // FLAG_EXCLUSIVE_(READ|WRITE) only grant exclusive access to the file on
   // creation on POSIX; for existing files, consider using Lock().
   enum Flags {
-    FLAG_OPEN = 1 << 0,             // Opens a file, only if it exists.
-    FLAG_CREATE = 1 << 1,           // Creates a new file, only if it does not
-                                    // already exist.
-    FLAG_OPEN_ALWAYS = 1 << 2,      // May create a new file.
-    FLAG_CREATE_ALWAYS = 1 << 3,    // May overwrite an old file.
-    FLAG_OPEN_TRUNCATED = 1 << 4,   // Opens a file and truncates it, only if it
-                                    // exists.
+    FLAG_OPEN = 1 << 0,            // Opens a file, only if it exists.
+    FLAG_CREATE = 1 << 1,          // Creates a new file, only if it does not
+                                   // already exist.
+    FLAG_OPEN_ALWAYS = 1 << 2,     // May create a new file.
+    FLAG_CREATE_ALWAYS = 1 << 3,   // May overwrite an old file.
+    FLAG_OPEN_TRUNCATED = 1 << 4,  // Opens a file and truncates it, only if it
+                                   // exists.
     FLAG_READ = 1 << 5,
     FLAG_WRITE = 1 << 6,
     FLAG_APPEND = 1 << 7,
-    FLAG_EXCLUSIVE_READ = 1 << 8,   // EXCLUSIVE is opposite of Windows SHARE.
+    FLAG_EXCLUSIVE_READ = 1 << 8,  // EXCLUSIVE is opposite of Windows SHARE.
     FLAG_EXCLUSIVE_WRITE = 1 << 9,
     FLAG_ASYNC = 1 << 10,
-    FLAG_TEMPORARY = 1 << 11,       // Used on Windows only.
-    FLAG_HIDDEN = 1 << 12,          // Used on Windows only.
+    FLAG_TEMPORARY = 1 << 11,  // Used on Windows only.
+    FLAG_HIDDEN = 1 << 12,     // Used on Windows only.
     FLAG_DELETE_ON_CLOSE = 1 << 13,
     FLAG_WRITE_ATTRIBUTES = 1 << 14,  // Used on Windows only.
     FLAG_SHARE_DELETE = 1 << 15,      // Used on Windows only.
@@ -85,6 +85,7 @@ class BASE_EXPORT File {
     FLAG_BACKUP_SEMANTICS = 1 << 17,  // Used on Windows only.
     FLAG_EXECUTE = 1 << 18,           // Used on Windows only.
     FLAG_SEQUENTIAL_SCAN = 1 << 19,   // Used on Windows only.
+    FLAG_DELETE = 1 << 20,            // Used on Windows only.

[Nico, 2017/01/10 18:04:15]

Maybe this could describe what this does, and when to use FLAG_DELETE and when
FLAG_DELETE_ON_CLOSE and what the difference is?

[grt (UTC plus 2), 2017/01/11 13:52:17]

Done.

   };
 
   // This enum has been recorded in multiple histograms. If the order of the
@@ -305,6 +306,14 @@ class BASE_EXPORT File {
   bool async() const { return async_; }
 
 #if defined(OS_WIN)
+  // Sets or clears the DeleteFile disposition on the handle. The handle must
+  // have been opened with FLAG_DELETE and must not have been opened with
+  // FLAG_DELETE_ON_CLOSE. Returns true if the disposition was set or cleared,
+  // as indicated by |delete_on_close|.
+  bool DeleteOnClose(bool delete_on_close);
+#endif
+
+#if defined(OS_WIN)
   static Error OSErrorToFileError(DWORD last_error);
 #elif defined(OS_POSIX)
   static Error OSErrorToFileError(int saved_errno);