Added 'contextReady' message for HostPairingScreen.

chrome/browser/chromeos/login/screens/screen_context.h

Index: chrome/browser/chromeos/login/screens/screen_context.h
diff --git a/chrome/browser/chromeos/login/screens/screen_context.h b/chrome/browser/chromeos/login/screens/screen_context.h
index 28072517e319d77ffc4d5efd57d250e3e5739ba4..317d1737d6645439a688336db7672a5e1f3cd521 100644
--- a/chrome/browser/chromeos/login/screens/screen_context.h
+++ b/chrome/browser/chromeos/login/screens/screen_context.h
@@ -84,6 +84,9 @@ class ScreenContext : public base::NonThreadSafe {
   void ApplyChanges(const base::DictionaryValue& diff,
                     std::vector<std::string>* keys);
 
+  // Returns underlying dictionary containing all the stored data.
+  const base::DictionaryValue& storage() const { return storage_; }
+
  private:
   bool Set(const KeyType& key, base::Value* value);