Reimplement inline signin with iframe

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 94a6ae75e03b223261f7579db38a67bdb76274d2..22e1ec07df2afe07d7cbce4fee2affb6fb35d9cd 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -799,6 +799,11 @@ void ChromeContentBrowserClient::GetStoragePartitionConfigForSite(
       *in_memory = false;
       partition_name->clear();
     }
+  } else if (site.SchemeIs(chrome::kChromeUIScheme) &&
+             site.host() == chrome::kChromeUIChromeSigninHost) {

[jam, 2014/01/26 02:51:46]

nit: site.GetOrigin().spec() == kChromeUIChromeSigninURL would be shorter

[guohui, 2014/01/29 12:50:51]

Done.

+    // Chrome signin page has an embedded iframe of extension and web content,
+    // thus it must be isolated from other webUI pages.
+    *partition_domain = chrome::kChromeUIChromeSigninHost;
   }
 
   // Assert that if |can_be_default| is false, the code above must have found a