[Sync] Initial implementation of foreign sessions suggestions provider.

components/ntp_snippets/BUILD.gn

Index: components/ntp_snippets/BUILD.gn
diff --git a/components/ntp_snippets/BUILD.gn b/components/ntp_snippets/BUILD.gn
index 3cc73ce7f424d3e2509ca3455873458e0d72d38e..9750cfd53bb83b49d4db8e6e087faf85346b29c5 100644
--- a/components/ntp_snippets/BUILD.gn
+++ b/components/ntp_snippets/BUILD.gn
@@ -53,8 +53,14 @@ static_library("ntp_snippets") {
     "physical_web_pages/physical_web_page_suggestions_provider.h",
     "pref_names.cc",
     "pref_names.h",
+    "pref_util.cc",
+    "pref_util.h",
     "request_throttler.cc",
     "request_throttler.h",
+    "sessions/foreign_sessions_suggestions_provider.cc",
+    "sessions/foreign_sessions_suggestions_provider.h",
+    "sessions/tab_delegate_sync_adapter.cc",
+    "sessions/tab_delegate_sync_adapter.h",
     "switches.cc",
     "switches.h",
     "user_classifier.cc",
@@ -83,7 +89,9 @@ static_library("ntp_snippets") {
     "//components/metrics",
     "//components/ntp_snippets/proto",
     "//components/offline_pages",
+    "//components/sessions",
     "//components/strings",
+    "//components/sync_sessions",
     "//components/variations",
     "//components/variations/net",
     "//third_party/icu/",
@@ -119,6 +127,7 @@ source_set("unit_tests") {
     "offline_pages/offline_page_suggestions_provider_unittest.cc",
     "physical_web_pages/physical_web_page_suggestions_provider_unittest.cc",
     "request_throttler_unittest.cc",
+    "sessions/foreign_sessions_suggestions_provider_unittest.cc",
   ]
 
   deps = [
@@ -131,10 +140,13 @@ source_set("unit_tests") {
     "//components/leveldb_proto:test_support",
     "//components/offline_pages",
     "//components/offline_pages:test_support",
+    "//components/sessions",
+    "//components/sessions:test_support",
     "//components/signin/core/browser:test_support",
     "//components/signin/core/common",
     "//components/strings",
     "//components/sync:test_support_sync_driver",
+    "//components/sync_sessions",
     "//components/variations",
     "//net:test_support",
     "//testing/gtest",