blimp: Move compositing, input and render widget feature to client/core.

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 86c3cc8bee4ccca718081e240a4d305612f7e67f..908b34bd68ab0258c5e61445491baf764179bc55 100644
--- a/blimp/client/core/blimp_client_context_impl.h
+++ b/blimp/client/core/blimp_client_context_impl.h
@@ -24,6 +24,7 @@ namespace blimp {
 namespace client {
 
 class BlimpContentsManager;
+class RenderWidgetFeature;
 
 // BlimpClientContextImpl is the implementation of the main context-class for
 // the blimp client.
@@ -72,6 +73,8 @@ 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<RenderWidgetFeature> render_widget_feature_;
+
   std::unique_ptr<BlimpContentsManager> blimp_contents_manager_;
 
   // Container struct for network components.