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

chrome/browser/ui/browser_instant_controller.cc

Index: chrome/browser/ui/browser_instant_controller.cc
diff --git a/chrome/browser/ui/browser_instant_controller.cc b/chrome/browser/ui/browser_instant_controller.cc
index 15ec0efa678a1b45dad23dd1d29a556d43671567..2a2532b6be755c5f96ff78fc8f7bfe002a128a79 100644
--- a/chrome/browser/ui/browser_instant_controller.cc
+++ b/chrome/browser/ui/browser_instant_controller.cc
@@ -161,6 +161,10 @@ void BrowserInstantController::UpdateThemeInfoForPreview() {
     OnThemeChanged(NULL);
 }
 
+void BrowserInstantController::SetMarginSize(int start, int end) {
+  instant_.SetMarginSize(start, end);
+}
+
 void BrowserInstantController::ResetInstant() {
   instant_.SetInstantEnabled(IsInstantEnabled(browser_->profile()));
 }