Add some remoting targets to GN build.

components/variations/BUILD.gn

Index: components/variations/BUILD.gn
diff --git a/components/variations/BUILD.gn b/components/variations/BUILD.gn
index 827155cf6e171053004447ecec98b786636df097..53384c3c67327dc4bf59ddba00a4a3d07ce7ce0b 100644
--- a/components/variations/BUILD.gn
+++ b/components/variations/BUILD.gn
@@ -6,6 +6,10 @@ static_library("variations") {
   sources = [
     "active_field_trials.cc",
     "active_field_trials.h",
+    "android/component_jni_registrar.cc",
+    "android/component_jni_registrar.h",
+    "android/variations_associated_data_android.cc",
+    "android/variations_associated_data_android.h",
     "caching_permuted_entropy_provider.cc",
     "caching_permuted_entropy_provider.h",
     "entropy_provider.cc",
@@ -16,10 +20,16 @@ static_library("variations") {
     "pref_names.h",
     "processed_study.cc",
     "processed_study.h",
+    "proto/client_variations.proto",
+    "proto/permuted_entropy_cache.proto",
+    "proto/study.proto",
+    "proto/variations_seed.proto",
     "study_filtering.cc",
     "study_filtering.h",
     "variations_associated_data.cc",
     "variations_associated_data.h",
+    "variations_http_header_provider.cc",
+    "variations_http_header_provider.h",
     "variations_seed_processor.cc",
     "variations_seed_processor.h",
     "variations_seed_simulator.cc",