Add test data for dynamic CLD.

chrome/test/data/cld2_component/README.chromium

+This directory contains a static copy of the contents of the CLD2 CRX file.
+The ID of the extension (as well as other relevant information) can be found
+in the following file:
+  src/chrome/browser/component_updater/cld_component_installer.cc 
+
+In general there should be little need to modify the data here. CLD2 updates
+are rare and consist of incremental improvements to language detection
+accuracy. All such updates are expected to be backwards-compatible from CLD2
+revision 160 onwards, which is what the initial checkin her is in fact based

[rmcilroy, 2014/05/19 13:16:02]

nit - s/which is what the initial checkin her is in fact based upon./which was
the initial version to be checked in. 

+upon. Any future format-breaking changes are likely to result in a "CLD3".
+
+For the sake of maintainability and clarity of purpose, the subdirectory that
+contains the CRX extract is named for the version that is contained within it.
+This mimics the behavior of the component updater and makes it obvious at a
+glance which version of the CRX is checked in here; if you DO update the
+content here, make sure to rename the directory and update the constant in the

[rmcilroy, 2014/05/19 13:16:02]

s/make sure to rename the directory/create a new directory for the new version/

(assuming you are wanting there always to be version 160 here to check backwards
compatibility).

+test utilities class:
+  src/chrome/browser/translate/translate_browser_test_utils.cc
+
+For more information about this directory and how to use it, contact the author:
+  andrewhayden@chromium.org

[rmcilroy, 2014/05/19 13:16:02]

nit - I would drop this and add a "or contact someone in the
src/third_party/cld_2/OWNERS file" in the paragraph below.

+
+for more information on CLD2, dynamic mode, and generating the data file see:

[rmcilroy, 2014/05/19 13:16:02]

/s/for/For

+  src/third_party/cld_2/README.chromium
+