Complete partial documentation of root .gn's secondary_source.

Review URL: https://codereview.chromium.org/578203003 Cr-Commit-Position: refs/heads/master@{#295565}

Complete partial documentation of root .gn's secondary_source.
Review URL: https://codereview.chromium.org/578203003 Cr-Commit-Position: refs/heads/master@{#295565}
ec4b3a4e · scheib · Commit bot · 5926b3d2 · ec4b3a4e
Commit ec4b3a4e authored Sep 18, 2014 by scheib Committed by Commit bot Sep 18, 2014
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--- a/.gn
+++ b/.gn
@@ -5,4 +5,6 @@
 buildconfig = "//build/config/BUILDCONFIG.gn"
 # The secondary source root is a parallel directory tree where
+# GN build files are placed when they can not be placed directly
+# in the source tree, e.g. for third party source trees.
 secondary_source = "//build/secondary/"