[Sync] Componentize synced_tab_delegate

components/sync_sessions.gypi

Index: components/sync_sessions.gypi
diff --git a/components/sync_sessions.gypi b/components/sync_sessions.gypi
index e7aed28a71fd8a48f89b6a2117ccb20b9b1ff854..883acbae9ec9deb91094b0df7bf4005f69c09e84 100644
--- a/components/sync_sessions.gypi
+++ b/components/sync_sessions.gypi
@@ -19,6 +19,10 @@
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
+        'sync_sessions/synced_tab_delegate.cc',
+        'sync_sessions/synced_tab_delegate.h',
+        'sync_sessions/sync_sessions_client.cc',
+        'sync_sessions/sync_sessions_client.h',
         'sync_sessions/revisit/current_tab_matcher.cc',
         'sync_sessions/revisit/current_tab_matcher.h',
         'sync_sessions/revisit/offset_tab_matcher.cc',
@@ -44,5 +48,22 @@
         }],
       ],
     },
-  ],
+    {
+      'target_name': 'sync_sessions_test_support',
+      'type': 'static_library',
+      'dependencies': [
+        'sync_sessions',
+        '../base/base.gyp:base',
+        '../sync/sync.gyp:sync',
+        '../testing/gtest.gyp:gtest',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'sync_sessions/fake_sync_sessions_client.cc',
+        'sync_sessions/fake_sync_sessions_client.h',
+      ],
+    }
+  ]
 }