Add BlimpView to a Chrome tab when Blimp is enabled.

blimp/client/core/dummy_blimp_client_context.cc

Index: blimp/client/core/dummy_blimp_client_context.cc
diff --git a/blimp/client/core/dummy_blimp_client_context.cc b/blimp/client/core/dummy_blimp_client_context.cc
index 97e5ada7c1a5c0ed8f33d80edd54926aeeccc082..5ebc115750153102694b621086a8f75005db8528 100644
--- a/blimp/client/core/dummy_blimp_client_context.cc
+++ b/blimp/client/core/dummy_blimp_client_context.cc
@@ -39,7 +39,8 @@ DummyBlimpClientContext::~DummyBlimpClientContext() {}
 void DummyBlimpClientContext::SetDelegate(
     BlimpClientContextDelegate* delegate) {}
 
-std::unique_ptr<BlimpContents> DummyBlimpClientContext::CreateBlimpContents() {
+std::unique_ptr<BlimpContents> DummyBlimpClientContext::CreateBlimpContents(
+    gfx::NativeWindow window) {
   return nullptr;
 }