cef/patch

There may be instances where CEF requires changes to the Chromium/WebKit code
base that are not desired by the Chromium/WebKit projects as a whole. To address
this situation the CEF project adds a patch capability as part of the CEF GYP
project generation step. The patch capability works as follows:

1. The CEF developer creates one or more patch files containing all required
   changes to the Chromium/WebKit code base and places those patch files in the
   "patches" subdirectory.
2. The CEF developer adds an entry for each patch file in the "patch.cfg" file.
3. CEF applies the patches to the Chromium/WebKit source tree using the
   patcher.py tool in the tools directory.  If necessary the patcher.py tool
   also rewrites the "patch_state.h" file which defines the CEF_PATCHES_APPLIED
   preprocessor value.

To disable automatic application of patches to the Chromium/WebKit code base
create an empty "NOPATCH" file in the "patch" directory. Sections of the CEF
code base that otherwise require patches will be disabled using the
CEF_PATCHES_APPLIED preprocessor value defined in the "patch_state.h" file. Be
warned that not applying all required patches may break important CEF
functionality.