Hooking MHTML generation to the browser.

base/platform_file_win.cc

Index: base/platform_file_win.cc
diff --git a/base/platform_file_win.cc b/base/platform_file_win.cc
index f448db065a7be5be284d95b9ad9df6fb2001de16..e531577d0246e5032f8e8bf4d62163825a89c315 100644
--- a/base/platform_file_win.cc
+++ b/base/platform_file_win.cc
@@ -217,4 +217,19 @@ bool GetPlatformFileInfo(PlatformFile file, PlatformFileInfo* info) {
   return true;
 }
 
+PlatformFile GetFileHandleForProcess(PlatformFile file,
+                                     ProcessHandle process,
+                                     bool close_source_handle) {
+  if (file == base::kInvalidPlatformFileValue)
+    return base::kInvalidPlatformFileValue;
+
+  PlatformFile result = base::kInvalidPlatformFileValue;
+  // Note that when |close_source_handle| is true, |file| is closed whether or
+  // not DuplicateHandle succeeds.
+  DuplicateHandle(GetCurrentProcess(), file, process, &result, 0, false,
+                  DUPLICATE_SAME_ACCESS |
+                      (close_source_handle ? DUPLICATE_CLOSE_SOURCE : 0));
+  return result;
+}
+
 }  // namespace disk_cache