Delegate decision what site instances can be rendered in what process to chrome

content/browser/content_browser_client.h

Index: content/browser/content_browser_client.h
diff --git a/content/browser/content_browser_client.h b/content/browser/content_browser_client.h
index 787273e9d135e100d26339c99cf22390285766ce..faabda4b1bed82154e0c56236fd3177b8363d7f2 100644
--- a/content/browser/content_browser_client.h
+++ b/content/browser/content_browser_client.h
@@ -23,6 +23,7 @@ class GURL;
 class MHTMLGenerationManager;
 class PluginProcessHost;
 class QuotaPermissionContext;
+class RenderProcessHost;
 class RenderViewHost;
 class ResourceDispatcherHost;
 class SSLCertErrorHandler;
@@ -124,6 +125,11 @@ class ContentBrowserClient {
   // SiteInstance.
   virtual bool IsURLSameAsAnySiteInstance(const GURL& url) = 0;
 
+  // Returns whether a new view for a given |site_url| can be launched in a
+  // given |process_host|.
+  virtual bool IsSuitableHost(RenderProcessHost* process_host,
+                              const GURL& site_url) = 0;
+
   // See CharacterEncoding's comment.
   virtual std::string GetCanonicalEncodingNameByAliasName(
       const std::string& alias_name) = 0;