Re-landing https://chromiumcodereview.appspot.com/11587012: Introduce mac_want_real_dsym GYP flag. By default, fake .dSYM files will be generated for regular builds, and dsymutils will be used to create .dSYMs for ASan builds. mac_want_real_dsym can be used to override this.
Re-landing https://chromiumcodereview.appspot.com/11587012: Introduce mac_want_real_dsym GYP flag.
By default, fake .dSYM files
will be generated for regular builds, and dsymutils will be used to create .dSYMs for ASan builds.
mac_want_real_dsym can be used to override this.

mac_real_dsym can't be set directly, because it's not a % variable.
According to https://codereview.chromium.org/113999, it can't be made a
% variable now, because of a bug in % handling in GYP that leads to
mac_real_dsym being unconditionally set to 1 for some targets.

BUG=148383
TBR=thakis
Review URL: https://codereview.chromium.org/11636014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@173896 0039d316-1c4b-4281-b951-d872f2087c98

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