Adds an IOSWebViewTypeParam() method to SearchTermsData.

components/search_engines/search_terms_data.h

Index: components/search_engines/search_terms_data.h
diff --git a/components/search_engines/search_terms_data.h b/components/search_engines/search_terms_data.h
index 2dcdd414eb45e1f8e6624900562337074ea893f9..96c88548993638163faf23d5c18e6f763894084a 100644
--- a/components/search_engines/search_terms_data.h
+++ b/components/search_engines/search_terms_data.h
@@ -70,6 +70,11 @@ class SearchTermsData {
   // non-empty for UIThreadSearchTermsData.
   virtual std::string NTPIsThemedParam() const;
 
+  // Returns a string indicating which webview is currently in use on iOS,
+  // suitable for adding as a query string param to search requests.  Returns an
+  // empty string if no parameter should be passed along with search requests.
+  virtual std::string IOSWebViewTypeParam() const;
+
   // Returns the value to use for replacements of type
   // GOOGLE_IMAGE_SEARCH_SOURCE.
   virtual std::string GoogleImageSearchSource() const;