Add TabControlFeature to BlimpClientContextImpl

blimp/client/core/contents/blimp_contents_observer_unittest.cc

Index: blimp/client/core/contents/blimp_contents_observer_unittest.cc
diff --git a/blimp/client/core/contents/blimp_contents_observer_unittest.cc b/blimp/client/core/contents/blimp_contents_observer_unittest.cc
index cf233338d9d08a46bc7ce3d604fa94b353e4f7c4..307e626c291b3c35702e69ceeccec6119bfe72c6 100644
--- a/blimp/client/core/contents/blimp_contents_observer_unittest.cc
+++ b/blimp/client/core/contents/blimp_contents_observer_unittest.cc
@@ -30,7 +30,7 @@ class BlimpContentsObserverTest : public BlimpContentsObserver {
 };
 
 TEST(BlimpContentsObserverUnittests, ObserverDies) {
-  BlimpContentsImpl contents(kDummyTabId);
+  BlimpContentsImpl contents(kDummyTabId, nullptr);
 
   std::unique_ptr<BlimpContentsObserver> observer =
       base::MakeUnique<BlimpContentsObserverTest>(&contents);
@@ -45,7 +45,7 @@ TEST(BlimpContentsObserverUnittests, ContentsDies) {
   std::unique_ptr<BlimpContentsObserverTest> observer;
 
   std::unique_ptr<BlimpContentsImpl> contents =
-      base::MakeUnique<BlimpContentsImpl>(kDummyTabId);
+      base::MakeUnique<BlimpContentsImpl>(kDummyTabId, nullptr);
   observer.reset(new BlimpContentsObserverTest(contents.get()));
   EXPECT_CALL(*observer, OnContentsDestroyed()).Times(1);
   EXPECT_EQ(observer->blimp_contents(), contents.get());