Support window.opener after a process swap.

content/common/content_client.h

Index: content/common/content_client.h
diff --git a/content/common/content_client.h b/content/common/content_client.h
index e985f4b24c9d2adfc5b757260ee20f181c3e16ab..5fda6d202814457e38a97d4a7a17db31c0b7e0bd 100644
--- a/content/common/content_client.h
+++ b/content/common/content_client.h
@@ -15,6 +15,10 @@ class GURL;
 struct GPUInfo;
 struct PepperPluginInfo;
 
+namespace IPC {
+class Message;
+}
+
 namespace content {
 
 class ContentBrowserClient;
@@ -49,6 +53,16 @@ class ContentClient {
   // Gives the embedder a chance to register its own pepper plugins.
   virtual void AddPepperPlugins(std::vector<PepperPluginInfo>* plugins) {}
 
+  // Returns whether the given message should be allowed to be sent from a
+  // swapped out renderer.
+  virtual bool CanSendWhileSwappedOut(const IPC::Message* msg) { return false; }
+
+  // Returns whether the given message should be processed in the browser on
+  // behalf of a swapped out renderer.
+  virtual bool CanHandleWhileSwappedOut(const IPC::Message& msg) {
+    return false;
+  }
+
  private:
   // The embedder API for participating in browser logic.
   ContentBrowserClient* browser_;