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

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chrome_content_browser_client.h"
 
 #include "base/command_line.h"
 #include "chrome/app/breakpad_mac.h"
 #include "chrome/browser/browser_about_handler.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 229 matching lines @@
   return true;
 }
 
 bool ChromeContentBrowserClient::IsURLSameAsAnySiteInstance(const GURL& url) {
   return url == GURL(chrome::kChromeUICrashURL) ||
          url == GURL(chrome::kChromeUIKillURL) ||
          url == GURL(chrome::kChromeUIHangURL) ||
          url == GURL(chrome::kChromeUIShorthangURL);
 }
 
+bool ChromeContentBrowserClient::IsSuitableHost(
+    RenderProcessHost* process_host,
+    const GURL& site_url) {
+  Profile* profile =
+      Profile::FromBrowserContext(process_host->browser_context());
+  ExtensionProcessManager* extension_process_manager =
+      profile->GetExtensionProcessManager();
+
+  // Maybe NULL during tests.
+  if (!extension_process_manager)
+    return true;
+
+  bool is_extension_host =
+      process_host->is_extension_process() ||
+      extension_process_manager->IsExtensionProcessHost(process_host->id());
+  return site_url.SchemeIs(chrome::kExtensionScheme) == is_extension_host;
+}
+
 std::string ChromeContentBrowserClient::GetCanonicalEncodingNameByAliasName(
     const std::string& alias_name) {
   return CharacterEncoding::GetCanonicalEncodingNameByAliasName(alias_name);
 }
 
 void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
     CommandLine* command_line, int child_process_id) {
 #if defined(USE_LINUX_BREAKPAD)
   if (IsCrashReporterEnabled()) {
     command_line->AppendSwitchASCII(switches::kEnableCrashReporter,
@@ skipping 553 matching lines @@
 #if defined(USE_NSS)
 crypto::CryptoModuleBlockingPasswordDelegate*
     ChromeContentBrowserClient::GetCryptoPasswordDelegate(
         const GURL& url) {
   return browser::NewCryptoModuleBlockingDialogDelegate(
       browser::kCryptoModulePasswordKeygen, url.host());
 }
 #endif
 
 }  // namespace chrome