Resubmit: Block content scripts from executing until user grants permission

chrome/browser/extensions/active_script_controller.cc

Index: chrome/browser/extensions/active_script_controller.cc
diff --git a/chrome/browser/extensions/active_script_controller.cc b/chrome/browser/extensions/active_script_controller.cc
index 822977d9d67b6d9cf3eee8cd6ca83e212cb03f75..d7b3e4bb2682da239fca5efffde2edb70a0094e3 100644
--- a/chrome/browser/extensions/active_script_controller.cc
+++ b/chrome/browser/extensions/active_script_controller.cc
@@ -110,7 +110,7 @@ void ActiveScriptController::OnActiveTabPermissionGranted(
 }
 
 void ActiveScriptController::OnAdInjectionDetected(
-    const std::set<std::string> ad_injectors) {
+    const std::set<std::string>& ad_injectors) {
   // We're only interested in data if there are ad injectors detected.
   if (ad_injectors.empty())
     return;
@@ -213,9 +213,10 @@ void ActiveScriptController::RunPendingForExtension(
   LocationBarController::NotifyChange(web_contents());
 }
 
-void ActiveScriptController::OnNotifyExtensionScriptExecution(
+void ActiveScriptController::OnRequestContentScriptPermission(
     const std::string& extension_id,
-    int page_id) {
+    int page_id,
+    int request_id) {
   if (!Extension::IdIsValid(extension_id)) {
     NOTREACHED() << "'" << extension_id << "' is not a valid id.";
     return;
@@ -229,18 +230,44 @@ void ActiveScriptController::OnNotifyExtensionScriptExecution(
   if (!extension)
     return;
 
-  // Right now, we allow all content scripts to execute, but notify the
-  // controller of them.
-  // TODO(rdevlin.cronin): Fix this in a future CL.
-  if (RequiresUserConsentForScriptInjection(extension))
-    RequestScriptInjection(extension, page_id, base::Bind(&base::DoNothing));
+  // If the request id is -1, that signals that the content script has already
+  // ran (because this feature is not enabled). Add the extension to the list of
+  // permitted extensions (for metrics), and return immediately.
+  if (request_id == -1) {
+    DCHECK(!enabled_);
+    permitted_extensions_.insert(extension->id());
+    return;
+  }
+
+  if (RequiresUserConsentForScriptInjection(extension)) {
+    // This base::Unretained() is safe, because the callback is only invoked by
+    // this object.
+    RequestScriptInjection(
+        extension,
+        page_id,
+        base::Bind(&ActiveScriptController::GrantContentScriptPermission,
+                   base::Unretained(this),
+                   request_id));
+  } else {
+    GrantContentScriptPermission(request_id);
+  }
+}
+
+void ActiveScriptController::GrantContentScriptPermission(int request_id) {
+  content::RenderViewHost* render_view_host =
+      web_contents()->GetRenderViewHost();
+  if (render_view_host) {
+    render_view_host->Send(new ExtensionMsg_GrantContentScriptPermission(
+                               render_view_host->GetRoutingID(),
+                               request_id));
+  }
 }
 
 bool ActiveScriptController::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ActiveScriptController, message)
-    IPC_MESSAGE_HANDLER(ExtensionHostMsg_NotifyExtensionScriptExecution,
-                        OnNotifyExtensionScriptExecution)
+    IPC_MESSAGE_HANDLER(ExtensionHostMsg_RequestContentScriptPermission,
+                        OnRequestContentScriptPermission)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;