Fixing a problem, where a hung renderer process is not killed when navigating away

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index 189ede627c20b9e1640592d658e5b7160bf4802c..f3cf6ec5242d6f35a00ba61413e48fe44238f149 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -113,6 +113,10 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Message::Sender,
   // the first IPC arrives.
   virtual base::ProcessHandle GetHandle() = 0;
 
+  // Returns true if the process can be killed if it is unresponsive. This will
+  // only be the case if there is only one view using this renderer process.
+  virtual bool AllowTerminateOnUnresponsive() const = 0;

[Charlie Reis, 2012/03/01 21:08:17]

We should move this to below SuddenTerminationAllowed and make the name more
consistent (with Allowed at the end).

I'm trying to decide if something like TerminateAfterLeavingAllowed() is a
better name, or if we want it to be more generic, like
IsUsedByMultipleViews()...  It's possible there may be other uses for this
check.

[nasko, 2012/03/01 22:50:15]

Done.

[Charlie Reis, 2012/03/02 00:16:43]

Upon reflection, I'm leaning toward something like IsSharedByMultipleViews(). 
This is information about a process state (is it shared or not?) that might
useful for many policy decisions-- whether to kill if leaving in an unresponsive
state, whether we should prerender in this tab, and possibly others.

[nasko, 2012/03/02 18:40:36]

This makes sense, especially if we want the prerendering to use this type of
information.

+
   // Transport DIB functions ---------------------------------------------------
 
   // Return the TransportDIB for the given id. On Linux, this can involve