Add one-time randomization support for FieldTrial, and the ability to

base/file_util_win.cc

Index: base/file_util_win.cc
diff --git a/base/file_util_win.cc b/base/file_util_win.cc
index 368961459b3efdf46cbba4422a6ae21d3a82ea35..748002f58919be0ed4976c0651c614b46a3642f3 100644
--- a/base/file_util_win.cc
+++ b/base/file_util_win.cc
@@ -558,6 +558,19 @@ bool GetShmemTempDir(FilePath* path) {
   return GetTempDir(path);
 }
 
+FilePath GetHomeDir() {

[jar (doing other things), 2011/04/21 01:03:50]

I don't think this is a good source of entropy.  ...but as per my comments where
it is used... I'm not sure you need this machine specific entropy.

[Jói, 2011/04/21 19:50:33]

 2011/04/21 01:03:50, jar wrote:
Switched to UMA ID.

+  wchar_t temp_path[MAX_PATH + 1];
+  HRESULT hr = ::SHGetFolderPath(
+      NULL, CSIDL_PROFILE, NULL, SHGFP_TYPE_CURRENT, temp_path);
+  // No error handling should be necessary for CSIDL_PROFILE; it must
+  // always exist (after all, we store Chrome data in a subdirectory of it)
+  // and it is not invalid. Use a hard CHECK to make sure we know if this
+  // assumption is broken in the wild.
+  CHECK(SUCCEEDED(hr));
+
+  return FilePath(temp_path);
+}
+
 bool CreateTemporaryFile(FilePath* path) {
   base::ThreadRestrictions::AssertIOAllowed();