Implement the Instant extended API startMargin, endMargin, and rtl properties and the onmarginchang…

chrome/browser/instant/instant_tab.cc

Index: chrome/browser/instant/instant_tab.cc
diff --git a/chrome/browser/instant/instant_tab.cc b/chrome/browser/instant/instant_tab.cc
index 302dba923d868508f2bd59f430376453ee571a2b..cb46eb162d756b16ad269aeb65b2e6deeeed9966 100644
--- a/chrome/browser/instant/instant_tab.cc
+++ b/chrome/browser/instant/instant_tab.cc
@@ -46,6 +46,10 @@ void InstantTab::UpOrDownKeyPressed(int count) {
   client_.UpOrDownKeyPressed(count);
 }
 
+void InstantTab::SetMarginSize(int start, int end) {
+  client_.SetMarginSize(start, end);
+}
+
 void InstantTab::SetSuggestions(
     const std::vector<InstantSuggestion>& suggestions) {
   InstantSupportDetermined(true);