Introduce a notion of "v8_code" in gyp config files.

Introduce a notion of "v8_code" in gyp config files.

This allows for compiling third-party code (such as ICU) with less
strict flags.

BUG=v8:2745
R=jkummerow@chromium.org

Committed: http://code.google.com/p/v8/source/detail?r=15389

[Jakob Kummerow, 2013-06-28 09:48:13]

LGTM if you merge the 'conditions' sections. 

Also, please verify that with this change V8 still compiles when embedded into
Chrome (where standalone.gypi isn't used).

https://codereview.chromium.org/18181006/diff/1/build/standalone.gypi
File build/standalone.gypi (right):

https://codereview.chromium.org/18181006/diff/1/build/standalone.gypi#newcode33
build/standalone.gypi:33: 'clang%': 0,
What's this needed for?

https://codereview.chromium.org/18181006/diff/1/build/standalone.gypi#newcode94
build/standalone.gypi:94: ['OS == "win"', {
Please merge this into the existing 'conditions' section in line 76.

[jochen (gone - plz use gerrit), 2013-06-28 10:09:15]

https://codereview.chromium.org/18181006/diff/1/build/standalone.gypi
File build/standalone.gypi (right):

https://codereview.chromium.org/18181006/diff/1/build/standalone.gypi#newcode33
build/standalone.gypi:33: 'clang%': 0,
On 2013/06/28 09:48:14, Jakob wrote:
> What's this needed for?

it's not really needed in this patch, so I'll remove it

https://codereview.chromium.org/18181006/diff/1/build/standalone.gypi#newcode94
build/standalone.gypi:94: ['OS == "win"', {
On 2013/06/28 09:48:14, Jakob wrote:
> Please merge this into the existing 'conditions' section in line 76.

Done.

[jochen (gone - plz use gerrit), 2013-06-28 10:12:51]

I made sure that v8 in chrome compiles just fine (as expected).

I also put some invalid flags in the target_conditions block to make sure it's
not evaluated for v8 code (so we don't accidentally strip the -Werror flag for
v8)

[Jakob Kummerow, 2013-06-28 15:22:53]

Committed patchset #2 manually as r15389 (presubmit successful).