Plumb the correct owner document through DocumentInit::m_owner.

The current code tries to determine the security origin to inherit (if
any) too late in document initialization. This results in strange and
hard to understand behavior.

For example, opener is not set until /after/ the document's security
context is already initialized. To make this work, initSecurityContext()
has a heuristic: if it should have inherited a security origin (e.g. the
URL is about:blank) but there's nothing to inherit from, it initializes
the security origin as unique, but then marks initialization as failed.

When the opener is /actually/ set, it then calls initSecurityContext()
again. Since the security context hasn't been marked as initialized yet,
the reinitialization is allowed to proceed, and now the frame inherits
its opener's security origin.

Rather than going through this elaborate dance, this CL gets rid of it
and proactively plumbs through the correct owner document to use. With
these changes:

- A security context can never be reinitialized. This requires passing
  the opener around when creating new windows, so that DocumentLoader
  can initialize the owner document correctly.
- javascript: URLs have different inheritance rules: the loading
  machinery can now just directly pass in the correct owner document.
- The exception for reusing a Window object when navigating from the
  initial empty Document has been removed: now it strictly follows the
  spec and reuses it iff it is same-origin to the new Document.

BUG=583445
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation

Review URL: https://codereview.chromium.org/1685003002

Cr-Commit-Position: refs/heads/master@{#378508}

1 files changed, 2 insertions, 1 deletions

diff --git a/extensions/browser/api/app_window/app_window_api.cc b/extensions/browser/api/app_window/app_window_api.cc
index 3e9f45f..4f5ffa5 100644
--- a/extensions/browser/api/app_window/app_window_api.cc
+++ b/extensions/browser/api/app_window/app_window_api.cc
@@ -340,7 +340,8 @@ bool AppWindowCreateFunction::RunAsync() {
 
   AppWindow* app_window =
       AppWindowClient::Get()->CreateAppWindow(browser_context(), extension());
-  app_window->Init(url, new AppWindowContentsImpl(app_window), create_params);
+  app_window->Init(url, new AppWindowContentsImpl(app_window),
+                   render_frame_host(), create_params);
 
   if (ExtensionsBrowserClient::Get()->IsRunningInForcedAppMode() &&
       !app_window->is_ime_window()) {