First pass at a meta-build wrapper for the gyp->gn migration

tools/mb/README.md

Index: tools/mb/README.md
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+# MB - The Meta-Build wrapper
+
+MB is a simple wrapper intended to provide a uniform interface to either
+GYP or GN, such that users and bots can call one script and not need to
+worry about whether a given bot is meant to use GN or GYP.
+
+It supports two main functions:
+
+1. "gen" - the main `gyp_chromium` / `gn gen` invocation that generates the
+   Ninja files needed for the build.
+
+2. "analyze" - the step that takes a list of modified files and a list of
+   desired targets and reports which targets will need to be rebuilt.
+
+We also use MBW as a forcing function to collect all of the different 

[scottmg, 2015/04/02 20:02:40]

MBW->MB

[Dirk Pranke, 2015/04/02 21:16:16]

will fix.

+build configurations that we actually support for Chromium builds into
+one place, in `src/build/mbw_conf.pyl`.

[scottmg, 2015/04/02 20:02:40]

same

[Dirk Pranke, 2015/04/02 21:16:16]

same.

+
+For more information, see:
+
+* [The Design Spec](docs/design_spec.md)
+* [The User Guide](docs/user_guide.md)