Introduce HostID and de-couple Extensions from "script injection System" [browser side]

extensions/common/user_script.cc

Index: extensions/common/user_script.cc
diff --git a/extensions/common/user_script.cc b/extensions/common/user_script.cc
index 4410290a55dfa5514f69f2afa71bd025a406ef54..14dacb36bd418fe6820e8eb92ec779efb00a4a49 100644
--- a/extensions/common/user_script.cc
+++ b/extensions/common/user_script.cc
@@ -85,11 +85,17 @@ UserScript::UserScript()
       emulate_greasemonkey_(false),
       match_all_frames_(false),
       match_about_blank_(false),
-      incognito_enabled_(false) {}
+      incognito_enabled_(false) {
+}
 
 UserScript::~UserScript() {
 }
 
+const std::string& UserScript::GetExtensionID() const {
+  DCHECK(consumer_id_.get());
+  return consumer_id_->host_id();
+}
+
 void UserScript::add_url_pattern(const URLPattern& pattern) {
   url_set_.AddPattern(pattern);
 }
@@ -138,13 +144,13 @@ void UserScript::File::Unpickle(const ::Pickle& pickle, PickleIterator* iter) {
 void UserScript::Pickle(::Pickle* pickle) const {
   // Write the simple types to the pickle.
   pickle->WriteInt(run_location());
-  pickle->WriteString(extension_id());
   pickle->WriteInt(user_script_id_);
   pickle->WriteBool(emulate_greasemonkey());
   pickle->WriteBool(match_all_frames());
   pickle->WriteBool(match_about_blank());
   pickle->WriteBool(is_incognito_enabled());
 
+  PickleConsumerID(pickle, consumer_id_);
   PickleGlobs(pickle, globs_);
   PickleGlobs(pickle, exclude_globs_);
   PickleURLPatternSet(pickle, url_set_);
@@ -162,6 +168,14 @@ void UserScript::PickleGlobs(::Pickle* pickle,
   }
 }
 
+void UserScript::PickleConsumerID(::Pickle* pickle,
+                                  linked_ptr<ConsumerID> consumer_id) const {
+  pickle->WriteInt(consumer_id->host_type());
+  pickle->WriteString(consumer_id->host_id());
+  pickle->WriteInt(consumer_id->instance_type());
+  pickle->WriteInt(consumer_id->instance_id());
+}
+
 void UserScript::PickleURLPatternSet(::Pickle* pickle,
                                      const URLPatternSet& pattern_list) const {
   pickle->WriteSizeT(pattern_list.patterns().size());
@@ -188,13 +202,13 @@ void UserScript::Unpickle(const ::Pickle& pickle, PickleIterator* iter) {
   CHECK(run_location >= 0 && run_location < RUN_LOCATION_LAST);
   run_location_ = static_cast<RunLocation>(run_location);
 
-  CHECK(iter->ReadString(&extension_id_));
   CHECK(iter->ReadInt(&user_script_id_));
   CHECK(iter->ReadBool(&emulate_greasemonkey_));
   CHECK(iter->ReadBool(&match_all_frames_));
   CHECK(iter->ReadBool(&match_about_blank_));
   CHECK(iter->ReadBool(&incognito_enabled_));
 
+  consumer_id_.reset(UnpickleConsumerID(pickle, iter).release());
   UnpickleGlobs(pickle, iter, &globs_);
   UnpickleGlobs(pickle, iter, &exclude_globs_);
   UnpickleURLPatternSet(pickle, iter, &url_set_);
@@ -215,6 +229,22 @@ void UserScript::UnpickleGlobs(const ::Pickle& pickle, PickleIterator* iter,
   }
 }
 
+linked_ptr<ConsumerID> UserScript::UnpickleConsumerID(const ::Pickle& pickle,
+                                                      PickleIterator* iter) {
+  int host_type;
+  std::string host_id;
+  int instance_type;
+  int instance_id;
+  CHECK(iter->ReadInt(&host_type));
+  CHECK(iter->ReadString(&host_id));
+  CHECK(iter->ReadInt(&instance_type));
+  CHECK(iter->ReadInt(&instance_id));
+  return make_linked_ptr(
+      new ConsumerID(static_cast<ConsumerID::HostType>(host_type), host_id,
+                     static_cast<ConsumerID::InstanceType>(instance_type),
+                     instance_id));
+}
+
 void UserScript::UnpickleURLPatternSet(const ::Pickle& pickle,
                                        PickleIterator* iter,
                                        URLPatternSet* pattern_list) {