Add ClientConfig proto, and JSON generation/parsing.

components/data_reduction_proxy.gypi

Index: components/data_reduction_proxy.gypi
diff --git a/components/data_reduction_proxy.gypi b/components/data_reduction_proxy.gypi
index e387910fc6f75d6c6377cd88278eccfdf957fd8f..86ecaea0b00cdd32f1a568c2dc9aa659448305e7 100644
--- a/components/data_reduction_proxy.gypi
+++ b/components/data_reduction_proxy.gypi
@@ -83,6 +83,7 @@
         '../net/net.gyp:net',
         '../url/url.gyp:url_lib',
         'data_reduction_proxy_core_common',
+        'data_reduction_proxy_proto',
         'pref_registry',
       ],
       'include_dirs': [
@@ -95,6 +96,8 @@
         'data_reduction_proxy/core/browser/data_reduction_proxy_bypass_protocol.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_config.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_config.h',
+        'data_reduction_proxy/core/browser/data_reduction_proxy_config_client.cc',
+        'data_reduction_proxy/core/browser/data_reduction_proxy_config_client.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_configurator.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_configurator.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc',
@@ -130,12 +133,15 @@
       'dependencies': [
         '../base/base.gyp:base',
         '../url/url.gyp:url_lib',
+        'data_reduction_proxy_proto',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
+        'data_reduction_proxy/core/common/client_config_parser.cc',
+        'data_reduction_proxy/core/common/client_config_parser.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_bypass_type_list.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_config_values.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_event_store.cc',
@@ -186,6 +192,24 @@
       'msvs_disabled_warnings': [4267, ],
     },
     {
+      # GN version: //components/data_reduction_proxy/proto
+      'target_name': 'data_reduction_proxy_proto',
+      'type': 'static_library',
+      'dependencies': [
+      ],
+      'include_dirs': [
+      ],
+      'sources': [
+        # Note: sources list duplicated in GN build.
+        'data_reduction_proxy/proto/client_config.proto',
+      ],
+      'variables': {
+        'proto_in_dir': 'data_reduction_proxy/proto',
+        'proto_out_dir': 'components/data_reduction_proxy/proto',
+      },
+      'includes': [ '../build/protoc.gypi' ],
+    },
+    {
       'target_name': 'data_reduction_proxy_version_header',
       'type': 'none',
       'direct_dependent_settings': {