Add a full Blimp integration test.

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 786330ceff5d8d24ad30ec6df07ae3b973e10eef..bfcc3f96824700babdabbba3d359a39c20751444 100644
--- a/blimp/client/public/blimp_client_context.h
+++ b/blimp/client/public/blimp_client_context.h
@@ -64,6 +64,7 @@ class BlimpClientContext : public KeyedService {
 
   // Start authentication flow and connection to engine.
   virtual void Connect() = 0;
+  virtual void ConnectWithAssignment(const Assignment& assignment) = 0;

[Khushal, 2016/09/13 04:47:24]

If its never meant to be used in production code, add ForTesting to this?

[David Trainor- moved to gerrit, 2016/09/13 06:18:04]

It's actually used by other methods internally when I cleaned up the connection
flow (Connect() -> ...... -> ConnectWithAssignment()).  I could add ForTesting
here and call a valid method internally, but that might be more ugly :(.  wdyt?

[Khushal, 2016/09/13 23:47:10]

Its fine, doesn't look like something too bad to be on the public API.

 
  protected:
   BlimpClientContext() = default;