<webview>: Move back, forward, canGoBack, canGoForward, go from content to chrome

chrome/browser/extensions/api/webview/webview_api.cc

Index: chrome/browser/extensions/api/webview/webview_api.cc
diff --git a/chrome/browser/extensions/api/webview/webview_api.cc b/chrome/browser/extensions/api/webview/webview_api.cc
index a5be9dfe60b17d3372c1edab6f2c38619d940695..ed9c5d000275d2ab5c2f32cab6c7db95abe91ea0 100644
--- a/chrome/browser/extensions/api/webview/webview_api.cc
+++ b/chrome/browser/extensions/api/webview/webview_api.cc
@@ -80,3 +80,24 @@ bool WebviewInsertCSSFunction::ShouldInsertCSS() const {
   return true;
 }
 
+WebviewGoFunction::WebviewGoFunction() {
+}
+
+WebviewGoFunction::~WebviewGoFunction() {
+}
+
+bool WebviewGoFunction::RunImpl() {
+  int instance_id;
+  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &instance_id));
+
+  int relative_index;
+  EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(1, &relative_index));
+
+  chrome::WebViewGuest* guest = chrome::WebViewGuest::From(
+    render_view_host()->GetProcess()->GetID(), instance_id);
+  if (!guest)
+    return false;
+
+  guest->Go(relative_index);
+  return true;
+}