Setup the delegate in Chrome, so we may put chrome java functions we need in blimp to the delegate …

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 e108782858c9b464d5829ef7c3cc4413b5ab8a4a..8758df4eeb71f8ac61489fbb21c5092d00ba7a0a 100644
--- a/blimp/client/core/blimp_client_context_impl.h
+++ b/blimp/client/core/blimp_client_context_impl.h
@@ -33,6 +33,9 @@ class BlimpClientContextImpl : public BlimpClientContext,
       scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner);
   ~BlimpClientContextImpl() override;
 
+  // Get BlimpClientContextDelegate which contains embedder callbacks.
+  BlimpClientContextDelegate* GetDelegate();
+
   // BlimpClientContext implementation.
   void SetDelegate(BlimpClientContextDelegate* delegate) override;
   std::unique_ptr<BlimpContents> CreateBlimpContents() override;