Add infrastructure to instantiate a helper plugin.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 9f8ba3ebb89eb4c871f33b7d9913943e7e212df8..29e7b65c5a472308c125ac0d385e1e516f1857eb 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -116,6 +116,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFormControlElement.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFormElement.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebHelperPlugin.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebHistoryItem.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputElement.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
@@ -1806,6 +1807,11 @@ bool RenderViewImpl::enumerateChosenDirectory(
       webkit_glue::WebStringToFilePath(path)));
 }
 
+void RenderViewImpl::initializeHelperPluginWebFrame(
+    WebKit::WebHelperPlugin* plugin) {
+  plugin->initializeFrame(this);
+}
+
 void RenderViewImpl::didStartLoading() {
   if (is_loading_) {
     DVLOG(1) << "didStartLoading called while loading";