Enable use of precompiled headers in Chromium port on Windows.

Enable use of precompiled headers in Chromium port on Windows.

Bug 76381 - Use precompiled headers in Chromium port on Windows
https://bugs.webkit.org/show_bug.cgi?id=76381

Patch by Joi Sigurdsson <joi@chromium.org> on 2012-01-19
Reviewed by Tony Chang.

Source/JavaScriptCore:

* JavaScriptCore.gyp/JavaScriptCore.gyp: Include WinPrecompile.gypi.

Source/Platform:

* Platform.gyp/Platform.gyp: Include WinPrecompile.gypi.

Source/WebCore:

No new tests needed; if the change builds and existing tests pass
that should provide enough coverage.

* WebCore.gyp/WebCore.gyp: Include WinPrecompile.gypi.

Source/WebKit/chromium:

* WebKit.gyp: Include WinPrecompile.gypi.
* WinPrecompile.cpp: Added.
* WinPrecompile.gypi: Added.
* WinPrecompile.h: Added.

Source/WTF:

* WTF.gyp/WTF.gyp: Include WinPrecompile.gypi.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105428 268f45cc-cd09-0410-ab3c-d52691b4dbfc