Plumb initiator out of Blink.

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index 47aaa5e2b0fdd89d0561924f2a61f84cdefa2945..730c16f91afe9c7d7b08e5197a1533f7ac59cd83 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -285,6 +285,7 @@ class BLINK_EXPORT WebFrameClient {
   struct NavigationPolicyInfo {
     WebDataSource::ExtraData* extraData;
 
+    WebLocalFrame* initiatorFrame;
     // Note: if browser side navigations are enabled, the client may modify
     // the urlRequest. However, should this happen, the client should change
     // the WebNavigationPolicy to WebNavigationPolicyIgnore, and the load
@@ -349,7 +350,8 @@ class BLINK_EXPORT WebFrameClient {
   virtual void didCreateDataSource(WebLocalFrame*, WebDataSource*) {}
 
   // A new provisional load has been started.
-  virtual void didStartProvisionalLoad(WebDataSource* dataSource,
+  virtual void didStartProvisionalLoad(WebLocalFrame* initiatorFrame,
+                                       WebDataSource* dataSource,
                                        WebURLRequest& request) {}
 
   // The provisional load was redirected via a HTTP 3xx response.