Don't swap processes for frames embedded in DevTools pages.

content/browser/frame_host/render_frame_host_manager.cc

Index: content/browser/frame_host/render_frame_host_manager.cc
diff --git a/content/browser/frame_host/render_frame_host_manager.cc b/content/browser/frame_host/render_frame_host_manager.cc
index 9dbe59ee237b2e27ce558d0fdbde93cb0c2d0ffc..27ab077ec2b87983feaded1fb5a996af51c27880 100644
--- a/content/browser/frame_host/render_frame_host_manager.cc
+++ b/content/browser/frame_host/render_frame_host_manager.cc
@@ -1572,6 +1572,11 @@ bool RenderFrameHostManager::IsRendererTransferNeededForNavigation(
   if (rfh->GetSiteInstance()->GetSiteURL().SchemeIs(kGuestScheme))
     return false;
 
+  // Don't swap processes for extensions embedded in DevTools. See
+  // https://crbug.com/564216.
+  if (rfh->GetSiteInstance()->GetSiteURL().SchemeIs(kChromeDevToolsScheme))

[Charlie Reis, 2015/12/02 19:56:07]

Maybe we can add a CHECK that the dest_url's scheme isn't HTTP or HTTPS?  Just
want to make sure we aren't opening a hole if DevTools later (or accidentally)
hosts web content.  (For example, if the extension somehow navigated itself to a
web page.)

[alexmos, 2015/12/02 22:44:17]

Done.  Good idea!

+    return false;
+
   BrowserContext* context = rfh->GetSiteInstance()->GetBrowserContext();
   GURL effective_url = SiteInstanceImpl::GetEffectiveURL(context, dest_url);