gn: define and use clang_base_path

gn: define and use clang_base_path

Replace uses of "//third_party/llvm-build/Release+Asserts"
with the configurable option clang_base_path.

TBR=thakis
BUG=

Committed: https://crrev.com/c1369c7c73fc9bcf2d9edb29e9c5b5ed0c5f66d5
Cr-Commit-Position: refs/heads/master@{#401551}

[sof, 2016-06-23 05:32:54]

Description was changed from

==========
Add gn Blink GC plugin options

The Blink GC clang plugin supports a couple of extra options which the
Blink GN configuration did not expose. Do so here, but without depending
on the 'flags' script used by the gyp build system
(tools/clang/scripts/blink_gc_plugin_flags.py).

Specifically, this adds the following Blink GN variables:

blink_gc_plugin_lib_path = "<path>"
overridable path to the directory of the GC plugin dynamic library.
blink_gc_plugin_option_do_dump_graph [ = false ]
emit JSON-serialized representation of class graph.
blink_gc_plugin_option_warn_unneeded_finalizer [ = false ]
warn of unnecessary destructor usage.

R=
BUG=
==========

to

==========
gn: define and use clang_base_path

Replace uses of "//third_party/llvm-build/Release+Asserts"
with the configurable option clang_base_path.

TBR=thakis
BUG=
==========

[sof, 2016-06-23 06:27:15]

sigbjornf@opera.com changed reviewers:
+ thakis@chromium.org

[sof, 2016-06-23 06:27:16]

please take a look.

Split out (&TBRed) from https://codereview.chromium.org/2081543002/

[sof, 2016-06-23 06:27:21]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-06-23 06:27:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2088373002/1

[commit-bot: I haz the power, 2016-06-23 06:32:06]

Description was changed from

==========
gn: define and use clang_base_path

Replace uses of "//third_party/llvm-build/Release+Asserts"
with the configurable option clang_base_path.

TBR=thakis
BUG=
==========

to

==========
gn: define and use clang_base_path

Replace uses of "//third_party/llvm-build/Release+Asserts"
with the configurable option clang_base_path.

TBR=thakis
BUG=
==========

[commit-bot: I haz the power, 2016-06-23 06:32:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-23 06:34:16]

Description was changed from

==========
gn: define and use clang_base_path

Replace uses of "//third_party/llvm-build/Release+Asserts"
with the configurable option clang_base_path.

TBR=thakis
BUG=
==========

to

==========
gn: define and use clang_base_path

Replace uses of "//third_party/llvm-build/Release+Asserts"
with the configurable option clang_base_path.

TBR=thakis
BUG=

Committed: https://crrev.com/c1369c7c73fc9bcf2d9edb29e9c5b5ed0c5f66d5
Cr-Commit-Position: refs/heads/master@{#401551}
==========

[commit-bot: I haz the power, 2016-06-23 06:34:17]

Patchset 1 (id:??) landed as
https://crrev.com/c1369c7c73fc9bcf2d9edb29e9c5b5ed0c5f66d5
Cr-Commit-Position: refs/heads/master@{#401551}