Add chrome platform analytics to third-party.

third_party/analytics/README.chromium

Index: third_party/analytics/README.chromium
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+Name: Chrome Platform Analytics
+URL: https://github.com/GoogleChrome/chrome-platform-analytics
+Version: 1.5.2
+Date: 2/5/2015
+License: Apache 2.0
+License File: NOT_SHIPPED
+Security Critical: yes
+
+Description:
+This package supports the use of Google Analytics (GA) in Chrome Platform
+Applications and Extensions.  
+
+The compiled, bundled version of the package is used, in order to avoid

[Steve McKay, 2015/02/10 15:32:20]

The library is available from GitHub both as closure JS source and as a
"compiled" bundle (traditional JS). The bundle is included here so that
traditional JS apps (non-closure-compiled) can employ the library.

[Ben Kwa, 2015/02/10 15:48:46]

Done.

+incurring dependencies on all of goog.*.

[Steve McKay, 2015/02/10 15:32:20]

s/incurring dependencies on all of goog.*./the need to closure-compile sources
that employ the library/

[Ben Kwa, 2015/02/10 15:48:46]

This seemed redundant given the previous comment.

+
+The SHA1 hash for this version of GoogleChrome/chrome-platform-analytics is
+e7c6f0e6ca6edfdd6cba0cd350516e55eb513959.
+
+Local Modifications:
+An externs file had to be added to account for chrome's js model, which is

[Steve McKay, 2015/02/10 15:32:20]

Added externs.js allowing apps that do use closure compiler to compile code
referencing this library.

[Ben Kwa, 2015/02/10 15:48:46]

Done.

+neither vanilla javascript, nor full-blown closure.