Get logging to chrome_debug.log working again on Windows Vista+.
Logging to the chrome_debug.log file is supposed to work across the browser, renderer, gpu process,
etc. However currently it only works in the browser. Reason being the chrome_debug.log file lives
in the same directory as chrome.exe and the fact that the GPU and renderer processes are launched in
low integrity on Vista+. In low integrity mode you have write access to folders and files which are
marked as being accessible from low and no write up, everywhere else.
Fix is to not initialize the logging system during the presandbox warmup on Windows and do it during
sandbox warmup. We also add a filesystem policy to allow access to the log file from the renderer
and GPU process.
The other change here is to remove the mutex and SetFilePointer code in the logging subsystem on Windows.
These exist for atomically appending to the log file. Windows provides that functionality via the FILE_APPEND_DATA
access mask.
BUG=532660
Review URL: https://codereview.chromium.org/1352713002
Cr-Commit-Position: refs/heads/master@{#349561}
4 files changed
