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 d2414432a1279126c920f91b515beec5858b5198..a5f463400433eaa14c163c046a9fdcc1c3b073a6 100644
--- a/blimp/client/core/blimp_client_context_impl.h
+++ b/blimp/client/core/blimp_client_context_impl.h
@@ -29,6 +29,9 @@ class BlimpClientContextImpl : public BlimpClientContext,
   BlimpClientContextImpl();
   ~BlimpClientContextImpl() override;
 
+  // Get BlimpClientContextDelegate which contains embedder callbacks.
+  BlimpClientContextDelegate* GetDelegate();
+
 #if defined(OS_ANDROID)
   BlimpClientContextImplAndroid* GetBlimpClientContextImplAndroid();
 #endif  // defined(OS_ANDROID)