V8 API: Add a missing NULL check into Isolate::GetCurrentContext().

V8 API: Add a missing NULL check into Isolate::GetCurrentContext().

There is a missing NULL check for: "internal_isolate->context() != NULL".
Right now before calling this method one should call v8::Context::InContext()
first to perform this check, otherwise we may crash. But this static method
will do this check on the current isolate, which may not be the same as a given one.

BUG=249655
R=yurys@chromium.org,mvstanton@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=15266

[aandrey, 2013-06-21 12:29:01]

On 2013/06/21 12:28:30, aandrey wrote:

Already lgtm'ed in https://codereview.appspot.com/10337043/

[yurys, 2013-06-21 12:34:56]

Committed patchset #1 manually as r15266.

[Michael Starzinger, 2013-06-21 12:37:53]

LGTM. Original CL: https://codereview.appspot.com/10337043/

[Jakob Kummerow, 2013-06-21 13:07:55]

Should this be included in the V8 branch for Chrome M29?

[yurys, 2013-06-21 15:03:33]

On 2013/06/21 13:07:55, Jakob wrote:
> Should this be included in the V8 branch for Chrome M29?

We discovered this issue on WebGL profiler only and came up with a workaround
for now so I don't think we should backport this change.