Initial work on making extensions work in incognito mode.

chrome/renderer/user_script_slave.cc

Index: chrome/renderer/user_script_slave.cc
diff --git a/chrome/renderer/user_script_slave.cc b/chrome/renderer/user_script_slave.cc
index a06d856176bd4c614a186c7bcbb83d9ee11c7fcd..0c0574bde40bed01380bba124978ef54b0302524 100644
--- a/chrome/renderer/user_script_slave.cc
+++ b/chrome/renderer/user_script_slave.cc
@@ -68,7 +68,8 @@ void UserScriptSlave::GetActiveExtensions(std::set<std::string>* extension_ids)
   }
 }
 
-bool UserScriptSlave::UpdateScripts(base::SharedMemoryHandle shared_memory) {
+bool UserScriptSlave::UpdateScripts(base::SharedMemoryHandle shared_memory,
+                                    bool only_inject_incognito) {
   scripts_.clear();
 
   // Create the shared memory object (read only).
@@ -101,6 +102,13 @@ bool UserScriptSlave::UpdateScripts(base::SharedMemoryHandle shared_memory) {
     UserScript* script = scripts_.back();
     script->Unpickle(pickle, &iter);
 
+    if (only_inject_incognito && !script->is_incognito_enabled()) {
+      // This script shouldn't run in an incognito tab.
+      delete script;
+      scripts_.pop_back();
+      continue;
+    }
+
     // Note that this is a pointer into shared memory. We don't own it. It gets
     // cleared up when the last renderer or browser process drops their
     // reference to the shared memory.