Add support for a "split" incognito behavior for extensions.

chrome/renderer/resources/extension_process_bindings.js

Index: chrome/renderer/resources/extension_process_bindings.js
diff --git a/chrome/renderer/resources/extension_process_bindings.js b/chrome/renderer/resources/extension_process_bindings.js
index fee9b4c720977c0db03543db6c83fc01dff06e14..378327890f39ba9fb919c7d6e7810a7c873601f1 100644
--- a/chrome/renderer/resources/extension_process_bindings.js
+++ b/chrome/renderer/resources/extension_process_bindings.js
@@ -19,6 +19,7 @@ var chrome = chrome || {};
   native function GetPopupView();
   native function SetIconCommon();
   native function IsExtensionProcess();
+  native function IsIncognitoProcess();
 
   var chromeHidden = GetChromeHidden();
 
@@ -296,7 +297,7 @@ var chrome = chrome || {};
   }
 
   chromeHidden.onLoad.addListener(function (extensionId) {
-    chrome.initExtension(extensionId, false);
+    chrome.initExtension(extensionId, false, IsIncognitoProcess());
 
     // |apiFunctions| is a hash of name -> object that stores the
     // name & definition of the apiFunction. Custom handling of api functions