Add zoom extension API

chrome/renderer/render_view.cc

Index: chrome/renderer/render_view.cc
diff --git a/chrome/renderer/render_view.cc b/chrome/renderer/render_view.cc
index 964e29241e65f57823f9a33b789adc50a680cdc4..9a7496d830f6af10485339383e20d93c08cc913f 100644
--- a/chrome/renderer/render_view.cc
+++ b/chrome/renderer/render_view.cc
@@ -4483,15 +4483,10 @@ void RenderView::OnZoom(PageZoom::Function function) {
   zoomLevelChanged();
 }
 
-void RenderView::OnSetZoomLevel(double zoom_level) {
-  // Don't set zoom level for full-page plugin since they don't use the same
-  // zoom settings.
-  if (webview()->mainFrame()->document().isPluginDocument())
-    return;
-
+void RenderView::OnSetZoomLevel(int request_id, double zoom_level) {
   webview()->hidePopups();
   webview()->setZoomLevel(false, zoom_level);
-  zoomLevelChanged();
+  zoomLevelChanged(request_id);
 }
 
 void RenderView::OnSetContentSettingsForLoadingURL(
@@ -5673,12 +5668,17 @@ void RenderView::zoomLimitsChanged(double minimum_level, double maximum_level) {
 }
 
 void RenderView::zoomLevelChanged() {
+  // Currently only extension zoom requests have a request id
+  zoomLevelChanged(-1);
+}
+
+void RenderView::zoomLevelChanged(int request_id) {
   bool remember = !webview()->mainFrame()->document().isPluginDocument();
 
   // Tell the browser which url got zoomed so it can update the menu and the
   // saved values if necessary
   Send(new ViewHostMsg_DidZoomURL(
-      routing_id_, webview()->zoomLevel(), remember,
+      routing_id_, request_id, webview()->zoomLevel(), remember,
       GURL(webview()->mainFrame()->url())));
 }