Add AssignmentSource to BlimpClientContextImpl

chrome/browser/android/blimp/chrome_blimp_client_context_delegate.cc

Index: chrome/browser/android/blimp/chrome_blimp_client_context_delegate.cc
diff --git a/chrome/browser/android/blimp/chrome_blimp_client_context_delegate.cc b/chrome/browser/android/blimp/chrome_blimp_client_context_delegate.cc
index 278df7868d359640a42634b805809af806b30e3a..dc1ca4e39be3ad3d18ed7e325992707d0939d9e7 100644
--- a/chrome/browser/android/blimp/chrome_blimp_client_context_delegate.cc
+++ b/chrome/browser/android/blimp/chrome_blimp_client_context_delegate.cc
@@ -27,3 +27,7 @@ void ChromeBlimpClientContextDelegate::AttachBlimpContentsHelpers(
     blimp::client::BlimpContents* blimp_contents) {
   AttachProfileToBlimpContents(blimp_contents, profile_);
 }
+
+void ChromeBlimpClientContextDelegate::OnAssignmentConnectionAttempted(
+    blimp::client::AssignmentRequestResult result,
+    const blimp::client::Assignment& assignment) {}