Add a macro (PP_ENUM) that ensures that enums are always 4 bytes. Wherever

possible (Visual Studio C++ and GCC C++0x mode), specify int32_t as the representation type of the enum.  For C, where enum gives us no type safety, just typedef an int32_t to the enum name.  In all other cases, use a compile-time assertion to ensure that enums are 4 bytes wide.

This change only applies the new PP_ENUM macro in 2 commonly used places.  This is to make sure that the (possibly contraversial) usage of variadic macro arguments is acceptable before I go change it everywhere.  If I can't use variadic macro arguments, I think I will have to separate this in to 2 macros and the enum declarations will look something like this:
PP_ENUM_BEGIN(PP_Bool)
PP_FALSE=0, PP_TRUE=1
PP_ENUM_END(PP_Bool)

BUG=61004
TEST=This should be exercised by all tests that use PP_Bool and PP_Var.

Suggestions for improvement are welcome, as always.
Review URL: http://codereview.chromium.org/4720005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@65704 0039d316-1c4b-4281-b951-d872f2087c98

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