Fix cross-renderer resource loads for <webview> with PlzNavigate.

extensions/browser/extension_navigation_throttle.cc

Index: extensions/browser/extension_navigation_throttle.cc
diff --git a/extensions/browser/extension_navigation_throttle.cc b/extensions/browser/extension_navigation_throttle.cc
index 4e511a5f7272b64f1ce7a86c1f999599afa51f9c..68c0a92e340da9750e1fcff31bd267476f9f0e00 100644
--- a/extensions/browser/extension_navigation_throttle.cc
+++ b/extensions/browser/extension_navigation_throttle.cc
@@ -4,18 +4,24 @@
 
 #include "extensions/browser/extension_navigation_throttle.h"
 
+#include "components/guest_view/browser/guest_view_base.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/url_constants.h"
 #include "extensions/browser/extension_registry.h"
+#include "extensions/browser/guest_view/web_view/web_view_guest.h"
+#include "extensions/browser/url_request_util.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 #include "extensions/common/manifest_handlers/web_accessible_resources_info.h"
+#include "extensions/common/manifest_handlers/webview_info.h"
 #include "extensions/common/permissions/api_permission.h"
 #include "extensions/common/permissions/permissions_data.h"
+#include "ui/base/page_transition_types.h"
 
 namespace extensions {
 
@@ -29,8 +35,9 @@ content::NavigationThrottle::ThrottleCheckResult
 ExtensionNavigationThrottle::WillStartRequest() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   GURL url(navigation_handle()->GetURL());
-  ExtensionRegistry* registry = ExtensionRegistry::Get(
-      navigation_handle()->GetWebContents()->GetBrowserContext());
+  content::WebContents* web_contents = navigation_handle()->GetWebContents();
+  ExtensionRegistry* registry =
+      ExtensionRegistry::Get(web_contents->GetBrowserContext());
 
   if (navigation_handle()->IsInMainFrame()) {
     // Block top-level navigations to blob: or filesystem: URLs with extension
@@ -57,6 +64,36 @@ ExtensionNavigationThrottle::WillStartRequest() {
         return content::NavigationThrottle::CANCEL;
     }
 
+    if (content::IsBrowserSideNavigationEnabled() &&
+        url.scheme() == extensions::kExtensionScheme) {
+      // This logic is performed for PlzNavigate sub-resources and for
+      // non-PlzNavigate in
+      // extensions::url_request_util::AllowCrossRendererResourceLoad.
+      const Extension* extension =
+          registry->enabled_extensions().GetExtensionOrAppByURL(url);
+      guest_view::GuestViewBase* guest =
+          guest_view::GuestViewBase::FromWebContents(web_contents);
+      if (guest) {
+        std::string owner_extension_id = guest->owner_host();
+        const Extension* owner_extension =
+            registry->enabled_extensions().GetByID(owner_extension_id);
+
+        std::string partition_domain, partition_id;
+        bool in_memory;
+        std::string resource_path = url.path();
+        bool is_guest = WebViewGuest::GetGuestPartitionConfigForSite(
+            navigation_handle()->GetStartingSiteInstance()->GetSiteURL(),
+            &partition_domain, &partition_id, &in_memory);
+
+        bool allowed = true;
+        url_request_util::AllowCrossRendererResourceLoadHelper(
+            is_guest, extension, owner_extension, partition_id, resource_path,
+            navigation_handle()->GetPageTransition(), &allowed);
+        if (!allowed)
+          return content::NavigationThrottle::CANCEL;
+      }
+    }
+
     return content::NavigationThrottle::PROCEED;
   }
 
@@ -76,7 +113,7 @@ ExtensionNavigationThrottle::WillStartRequest() {
   // the ancestor chain, so find the current RenderFrameHost and use it to
   // traverse up to the main frame.
   content::RenderFrameHost* navigating_frame = nullptr;
-  for (auto* frame : navigation_handle()->GetWebContents()->GetAllFrames()) {
+  for (auto* frame : web_contents->GetAllFrames()) {
     if (frame->GetFrameTreeNodeId() ==
         navigation_handle()->GetFrameTreeNodeId()) {
       navigating_frame = frame;