Entering debugger scope should not make debugger active.

The motivation is that by only entering the debugger scope to call into
the debug context should not cause code to be compiled for debugging.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/306563002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21645 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Support external startup data in V8.

If the embedder chooses, the 'natives' (library sources) and the
precompiled startup blob can be written to files during the build
process and handed over to V8 at startup. The main purpose would be
to reduce the size of the compiled binary for space constrained
platforms.

The build-time option is off by default. Nothing should change if
it's not enabled.

BUG=
R=bmeurer@chromium.org, jochen@chromium.org

Review URL: https://codereview.chromium.org/293993021

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21646 ce2b1a6d-e550-0410-aec6-3dcde31c8c00