Add BlimpView to a Chrome tab when Blimp is enabled.

blimp/client/core/contents/blimp_contents_manager.h

Index: blimp/client/core/contents/blimp_contents_manager.h
diff --git a/blimp/client/core/contents/blimp_contents_manager.h b/blimp/client/core/contents/blimp_contents_manager.h
index 9b58e76186bb9cd19145a2b6161ca04b2639c05f..d031d6232fdbd9560bead0384a47476827cd33a9 100644
--- a/blimp/client/core/contents/blimp_contents_manager.h
+++ b/blimp/client/core/contents/blimp_contents_manager.h
@@ -6,6 +6,7 @@
 #define BLIMP_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_MANAGER_H_
 
 #include "blimp/client/core/contents/blimp_contents_impl.h"
+#include "ui/gfx/native_widget_types.h"
 
 namespace blimp {
 namespace client {
@@ -23,7 +24,8 @@ class BlimpContentsManager {
   ~BlimpContentsManager();
 
   // Builds a BlimpContentsImpl and notifies the engine.
-  std::unique_ptr<BlimpContentsImpl> CreateBlimpContents();
+  std::unique_ptr<BlimpContentsImpl> CreateBlimpContents(
+      gfx::NativeWindow window);
 
   // The caller can query the contents through its id.
   BlimpContentsImpl* GetBlimpContents(int id);