Add TabControlFeature to BlimpClientContextImpl

blimp/client/core/blimp_client_context_impl.h

Index: blimp/client/core/blimp_client_context_impl.h
diff --git a/blimp/client/core/blimp_client_context_impl.h b/blimp/client/core/blimp_client_context_impl.h
index 8243b4016fca073f9ff0701af5cf5406260b32ec..0748e23d3d9f43e276c35cf1dbefa58e5781586b 100644
--- a/blimp/client/core/blimp_client_context_impl.h
+++ b/blimp/client/core/blimp_client_context_impl.h
@@ -25,6 +25,7 @@ namespace blimp {
 namespace client {
 
 class BlimpContentsManager;
+class TabControlFeature;
 
 // BlimpClientContextImpl is the implementation of the main context-class for
 // the blimp client.
@@ -49,6 +50,8 @@ class BlimpClientContextImpl : public BlimpClientContext,
   void OnConnected() override;
   void OnDisconnected(int result) override;
 
+  TabControlFeature* GetTabControlFeature() const;
+
  protected:
   // Returns the URL to use for connections to the assigner. Used to construct
   // the AssignmentSource.
@@ -63,6 +66,8 @@ class BlimpClientContextImpl : public BlimpClientContext,
   virtual void ConnectWithAssignment(AssignmentRequestResult result,
                                      const Assignment& assignment);
 
+  void RegisterFeatures();
+
   // Provides functionality from the embedder.
   BlimpClientContextDelegate* delegate_ = nullptr;
 
@@ -76,6 +81,8 @@ class BlimpClientContextImpl : public BlimpClientContext,
   // Connect() to get a valid assignment and later connect to the engine.
   std::unique_ptr<AssignmentSource> assignment_source_;
 
+  std::unique_ptr<TabControlFeature> tab_control_feature_;
+
   std::unique_ptr<BlimpContentsManager> blimp_contents_manager_;
 
   // Container struct for network components.