Initial work on making extensions work in incognito mode.

chrome/browser/extensions/extensions_service.cc

Index: chrome/browser/extensions/extensions_service.cc
diff --git a/chrome/browser/extensions/extensions_service.cc b/chrome/browser/extensions/extensions_service.cc
index 7dddfa986790f0555b2c8f6707b3cfce88b2bca9..476f640f58fe64d813b8c0f801a443f6a4e8fdf0 100644
--- a/chrome/browser/extensions/extensions_service.cc
+++ b/chrome/browser/extensions/extensions_service.cc
@@ -529,6 +529,16 @@ base::Time ExtensionsService::LastPingDay(const std::string& extension_id) {
   return extension_prefs_->LastPingDay(extension_id);
 }
 
+bool ExtensionsService::IsIncognitoEnabled(const std::string& extension_id) {
+  Extension* extension = GetExtensionById(extension_id, true);
+  if (!extension)
+    return false;
+
+  return extension_prefs_->IsIncognitoEnabled(extension_id) &&
+      extension->HasApiPermission(Extension::kExperimentalPermission) &&
+      extension->HasApiPermission(Extension::kIncognitoPermission);
+}
+
 void ExtensionsService::CheckForExternalUpdates() {
   // This installs or updates externally provided extensions.
   // TODO(aa): Why pass this list into the provider, why not just filter it