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

chrome/common/extensions/extension.h

Index: chrome/common/extensions/extension.h
diff --git a/chrome/common/extensions/extension.h b/chrome/common/extensions/extension.h
index 9f2dc9ba2c6f0594bd5c9449b5a66da5dedc5a31..f46c0ca6afafec80b22998c7f72d5bfb4e9237ee 100644
--- a/chrome/common/extensions/extension.h
+++ b/chrome/common/extensions/extension.h
@@ -364,6 +364,7 @@ class Extension {
   LaunchContainer launch_container() const { return launch_container_; }
   int launch_width() const { return launch_width_; }
   int launch_height() const { return launch_height_; }
+  bool incognito_split_mode() const { return incognito_split_mode_; }
 
   // Gets the fully resolved absolute launch URL.
   GURL GetFullLaunchURL() const;
@@ -580,6 +581,10 @@ class Extension {
   // The omnibox keyword for this extension, or empty if there is none.
   std::string omnibox_keyword_;
 
+  // If true, a separate process will be used for the extension in incognito
+  // mode.
+  bool incognito_split_mode_;
+
   // Runtime data:
 
   // True if the background page is ready.