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

blimp/client/public/blimp_client_context.h

Index: blimp/client/public/blimp_client_context.h
diff --git a/blimp/client/public/blimp_client_context.h b/blimp/client/public/blimp_client_context.h
index 8b8638f00417f2dac943ac73c3e97b2a8873a151..d8d200a907e18c373b62c79a43fff7d8d006af8b 100644
--- a/blimp/client/public/blimp_client_context.h
+++ b/blimp/client/public/blimp_client_context.h
@@ -37,6 +37,12 @@ class BlimpClientContext : public KeyedService {
       BlimpClientContext* blimp_client_context);
 #endif  // defined(OS_ANDROID)
 
+  // Must be called only once, on browser startup.
+  static void Initialize();
+
+  // Must be called only once, on browser shutdown.
+  static void Terminate();
+
   // Creates a BlimpClientContext. The implementation of this function
   // depends on whether the core or dummy implementation of Blimp has been
   // linked in.