managing chromes use section of docs

site/dev/chrome/repo.md

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+How to manage a Skia repo inside a Chromium repo
+================================================
+
+To work on Skia inside a Chromium checkout, run the following:
+
+~~~~
+$ cd chromium/src/third_party/skia
+$ tools/git-sync-deps
+~~~~
+
+This command does a minimal "just sync the DEPS" emulation of gclient sync for
+Skia into chromium/src/third_party/skia/third_party.  After that, make dm or
+./gyp_skia && ninja -C out/Debug dm in chromium/src/third_party/skia will get
+you rolling.
+
+We no longer recommend the .gclient file manipulation to have Chromium DEPS also
+sync Skia's DEPS.  Most of those DEPS are for building and testing only;
+Chromium doesn't need any of them, and it can be confusing and problematic if
+they somehow get mixed into the Chromium build.