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 ba634a30ab6157a8274c7044d6f28c283fe57df1..d99286e84265087b3eda60256b94e6430f4ef9e1 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -118,6 +118,7 @@
 #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"
@@ -1805,6 +1806,11 @@ 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";