Add BlimpView to a Chrome tab when Blimp is enabled.

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 52573d3a726e438e4bc4b0ffa1083320b5237447..50b4b69bd2f511e8e63121d53f8f48c481fbe2d7 100644
--- a/blimp/client/public/blimp_client_context.h
+++ b/blimp/client/public/blimp_client_context.h
@@ -13,6 +13,7 @@
 #include "blimp/client/public/blimp_client_context_delegate.h"
 #include "blimp/client/public/contents/blimp_contents.h"
 #include "components/keyed_service/core/keyed_service.h"
+#include "ui/gfx/native_widget_types.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/jni_android.h"
@@ -51,8 +52,9 @@ class BlimpClientContext : public KeyedService {
   // The delegate provides all the required functionality from the embedder.
   virtual void SetDelegate(BlimpClientContextDelegate* delegate) = 0;
 
-  // Creates a new BlimpContents.
-  virtual std::unique_ptr<BlimpContents> CreateBlimpContents() = 0;
+  // Creates a new BlimpContents that will be shown in |window|.
+  virtual std::unique_ptr<BlimpContents> CreateBlimpContents(
+      gfx::NativeWindow window) = 0;
 
   // Start authentication flow and connection to engine.
   virtual void Connect() = 0;