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  In order to roll GN 5478ca08..a0a05a85 (r528993:r533513) and pick up
  the following changes:

  e93e6df0 Fix gn bootstrap on systems with an old libstdc++
  9a22cda9 Fix GN thread sanitizer bug.
  f7f761c7 Fix misspellings in GN reference
  7c742b6e Fix 'gn gen --check' hanging indefinitely
  31360b70 GN: Fix a memory leak found by LSAN.
  5d253161 Fix gn CHECK()ing when generating Chromium build files
  ff4e4bf5 Reland "android: Don't parse /proc/self/maps to prefetch the library."
  733c2818 Revert "android: Don't parse /proc/self/maps to prefetch the library."
  4c48a351 Support pool for action_foreach
  0b186aa6 Fix gn bootstrap
  ef6f0fb3 android: Don't parse /proc/self/maps to prefetch the library.
  2f14ea14 Add support for include_dirs to gn check.
  cb4f92cc Remove usage of SequencedWorkerPool in GN.
  4c762522 Fix gn bootstrap
  2b31dbb2 android: fix the "end of text" sentinel with lld.

The most notable change here is 2f14ea14, which changes `gn check` to check
includes that are relative to something other than the source root; it
checks against every dir in include_dirs instead. Previously if a file wasn't
located relative to the src root it was just ignored. Now we're able to catch
more errors as a result.

TBR=brettw@chromium.org, slan@chromium.org, kapishnikov@chromium.org, eugenebut@chromium.org



Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ib8164ae81da6b14dacc8db74d2765d62d4dc3761
Reviewed-on: https://chromium-review.googlesource.com/896949Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Reviewed-by: Stephen Lanham <slan@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534469}