NOT YET READY: Improve granularity of window namespaces in Blink.

chrome/renderer/extensions/chrome_extensions_renderer_client.cc

Index: chrome/renderer/extensions/chrome_extensions_renderer_client.cc
diff --git a/chrome/renderer/extensions/chrome_extensions_renderer_client.cc b/chrome/renderer/extensions/chrome_extensions_renderer_client.cc
index b1127e949e6dfdc908f093ff19dcd69512884b8a..3b1256b16ff7952ac091bb4122f246b90d4cb5c7 100644
--- a/chrome/renderer/extensions/chrome_extensions_renderer_client.cc
+++ b/chrome/renderer/extensions/chrome_extensions_renderer_client.cc
@@ -22,6 +22,7 @@
 #include "chrome/renderer/media/cast_ipc_dispatcher.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/content_switches.h"
+#include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
@@ -298,6 +299,15 @@ ChromeExtensionsRendererClient::CreateBrowserPluginDelegate(
                                                   original_url);
 }
 
+// static
+blink::WebFrame* ChromeExtensionsRendererClient::FindFrame(
+    blink::WebLocalFrame* relative_to_frame,
+    const std::string& name) {
+  content::RenderFrame* result = extensions::ExtensionFrameHelper::FindFrame(
+      content::RenderFrame::FromWebFrame(relative_to_frame), name);
+  return result ? result->GetWebFrame() : nullptr;
+}
+
 void ChromeExtensionsRendererClient::RunScriptsAtDocumentStart(
     content::RenderFrame* render_frame) {
   extension_dispatcher_->RunScriptsAtDocumentStart(render_frame);