Introduce bindings.gyp

Source/WebCore/WebCore.gypi

 {
     'variables': {
         'webcore_bindings_idl_files': [
             'Modules/battery/BatteryManager.idl',

[Nico, 2013/04/11 05:56:37]

Are you planning on moving the idl files out of WebCore.gypi eventually? If so,
ignore the other comment in this file.

[abarth-chromium, 2013/04/11 06:25:17]

I haven't worked that out entirely.  My current thinking is that webcore and
modules will export a list of IDL files so that the OWNERS of those modules can
manage their list of IDL files.  The bindings layer will consume those lists and
generate code from them.

             'Modules/battery/NavigatorBattery.idl',
             'Modules/filesystem/DOMFileSystem.idl',
             'Modules/filesystem/DOMFileSystemSync.idl',
             'Modules/filesystem/DOMWindowFileSystem.idl',
             'Modules/filesystem/DataTransferItemFileSystem.idl',
             'Modules/filesystem/DirectoryEntry.idl',
             'Modules/filesystem/DirectoryEntrySync.idl',
             'Modules/filesystem/DirectoryReader.idl',
             'Modules/filesystem/DirectoryReaderSync.idl',
             'Modules/filesystem/EntriesCallback.idl',
@@ skipping 4858 matching lines @@
             'platform/chromium/support/WebTransformKeyframe.cpp',
             'platform/chromium/support/WebURL.cpp',
             'platform/chromium/support/WebURLError.cpp',
             'platform/chromium/support/WebURLRequest.cpp',
             'platform/chromium/support/WebURLRequestPrivate.h',
             'platform/chromium/support/WebURLResponse.cpp',
             'platform/chromium/support/WebURLResponsePrivate.h',
             'platform/chromium/support/WrappedResourceRequest.h',
             'platform/chromium/support/WrappedResourceResponse.h',
         ],
+
+        'conditions': [
+            ['OS=="win"', {
+              # Using native perl rather than cygwin perl cuts execution time of idl
+              # preprocessing rules by a bit more than 50%.
+              'perl_exe': '<(DEPTH)/third_party/perl/perl/bin/perl.exe',
+              'gperf_exe': '<(DEPTH)/third_party/gperf/bin/gperf.exe',
+              'bison_exe': '<(DEPTH)/third_party/bison/bin/bison.exe',
+              # Using cl instead of cygwin gcc cuts the processing time from
+              # 1m58s to 0m52s.
+              'preprocessor': '--preprocessor "cl.exe -nologo -EP -TP"',
+            },{
+              'perl_exe': 'perl',
+              'gperf_exe': 'gperf',
+              'bison_exe': 'bison',
+
+              # We specify a preprocess so it happens locally and won't get distributed to goma.
+              # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to use /usr/bin/clang once we require Xcode 4.x.
+              'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
+            }],
+        ],
     }
 }