Add a new CldDataSource class that can be queried at runtime.

components/translate.gypi

Index: components/translate.gypi
diff --git a/components/translate.gypi b/components/translate.gypi
index 0c738c204767e6463115c57a57474100c1aeb0d8..1280e578deee56766bdd10d8fc4124f6ea4e9fbc 100644
--- a/components/translate.gypi
+++ b/components/translate.gypi
@@ -175,6 +175,7 @@
             # Note: sources list duplicated in GN build.
             'translate/content/common/translate_messages.cc',
             'translate/content/common/translate_messages.h',
+            'translate/content/common/cld_data_source.h',
            ],
            'conditions': [
              ['cld2_data_source=="standalone" or cld2_data_source=="component"', {
@@ -183,6 +184,21 @@
                  'translate/content/common/data_file_cld_data_provider_messages.h',
                ]},
              ],
+             ['cld2_data_source=="standalone"', {
+               'sources': [
+                 'translate/content/common/standalone_cld_data_source.cc',
+               ]},
+             ],
+             ['cld2_data_source=="component"', {
+               'sources': [
+                 'translate/content/common/component_cld_data_source.cc',
+               ]},
+             ],
+             ['cld2_data_source=="static"', {
+               'sources': [
+                 'translate/content/common/static_cld_data_source.cc',
+               ]},
+             ],
            ],
         },
         {