rac] Add re2 dependency to libaddressinput.

third_party/libaddressinput/chromium/cpp/README

Index: third_party/libaddressinput/chromium/cpp/README
diff --git a/third_party/libaddressinput/chromium/cpp/README b/third_party/libaddressinput/chromium/cpp/README
index b9ecff26d883ac73f9cf25f289911fb6f08be758..1d2194220d83e2d7c839f51e7b82d86061805ee2 100644
--- a/third_party/libaddressinput/chromium/cpp/README
+++ b/third_party/libaddressinput/chromium/cpp/README
@@ -21,11 +21,12 @@ GYP: Generates the build files.
 Ninja: Executes the build files.
 GTest: Used for unit tests.
 Python: Used by GRIT, which generates localization files.
+RE2: Used for validating postal code format.
 
 Most of these packages are available on Debian-like distributions. You can
 install them with this command:
 
-$ sudo apt-get install gyp ninja-build libgtest-dev python
+$ sudo apt-get install gyp ninja-build libgtest-dev python libre2-dev
 
 Make sure that your version of GYP is at least 0.1~svn1395. Older versions of
 GYP do not generate the Ninja build files correctly. You can download a
@@ -38,6 +39,7 @@ http://packages.ubuntu.com/saucy/gyp
 http://packages.ubuntu.com/saucy/ninja-build
 http://packages.ubuntu.com/saucy/libgtest-dev
 http://packages.ubuntu.com/saucy/python
+http://packages.debian.org/experimental/libre2-dev
 
 Alternatively, you can download, build, and install these tools and libraries
 from source code. Their home pages contain information on how to accomplish
@@ -47,6 +49,7 @@ https://code.google.com/p/gyp/
 http://martine.github.io/ninja/
 https://code.google.com/p/googletest/
 http://python.org/
+https://code.google.com/p/re2/
 
 Build
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