Repository: electron/electron
Pull request: fix: ensure `SetPluginCanSave` updated in PDFs

#### Description of Change

Refs https://issues.chromium.org/issues/40469585

Ensure fillable PDF forms are able to be saved correctly with and without edits in all contexts.

#### Checklist
<!-- Remove items that do not apply. For completed items, change [ ] to [x]. -->

- [x] PR description included and stakeholders cc'd
- [x] `npm test` passes
- [x] [PR release notes](https://github.com/electron/clerk/blob/main/README.md) describe the change in a way relevant to app developers, and are [capitalized, punctuated, and past tense](https://github.com/electron/clerk/blob/main/README.md#examples).

#### Release Notes

Notes: Fixed a potential issue with fillable PDF forms saving correctly in some circumstances.

Changed files:
filename: shell/browser/electron_pdf_document_helper_client.cc
patch: @@ -4,8 +4,14 @@
 
 #include "shell/browser/electron_pdf_document_helper_client.h"
 
+#include "chrome/browser/pdf/pdf_viewer_stream_manager.h"
+#include "chrome/common/content_restriction.h"
+#include "components/pdf/browser/pdf_frame_util.h"
+#include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
+#include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h"
 #include "pdf/content_restriction.h"
+#include "pdf/pdf_features.h"
 #include "shell/browser/api/electron_api_web_contents.h"
 
 ElectronPDFDocumentHelperClient::ElectronPDFDocumentHelperClient() = default;
@@ -15,8 +21,8 @@ void ElectronPDFDocumentHelperClient::UpdateContentRestrictions(
     content::RenderFrameHost* render_frame_host,
     int content_restrictions) {
   // UpdateContentRestrictions potentially gets called twice from
-  // pdf/pdf_view_web_plugin.cc.  The first time it is potentially called is
-  // when loading starts and it is called with a restriction on printing.  The
+  // pdf/pdf_view_web_plugin.cc. The first time it is potentially called is
+  // when loading starts and it is called with a restriction on printing. The
   // second time it is called is when loading is finished and if printing is
   // allowed there won't be a printing restriction passed, so we can use this
   // second call to notify that the pdf document is ready to print.
@@ -31,3 +37,29 @@ void ElectronPDFDocumentHelperClient::UpdateContentRestrictions(
     }
   }
 }
+
+void ElectronPDFDocumentHelperClient::SetPluginCanSave(
+    content::RenderFrameHost* render_frame_host,
+    bool can_save) {
+  if (chrome_pdf::features::IsOopifPdfEnabled()) {
+    auto* pdf_viewer_stream_manager =
+        pdf::PdfViewerStreamManager::FromWebContents(
+            content::WebContents::FromRenderFrameHost(render_frame_host));
+    if (!pdf_viewer_stream_manager) {
+      return;
+    }
+
+    content::RenderFrameHost* embedder_host =
+        pdf_frame_util::GetEmbedderHost(render_frame_host);
+    CHECK(embedder_host);
+
+    pdf_viewer_stream_manager->SetPluginCanSave(embedder_host, can_save);
+    return;
+  }
+
+  auto* guest_view =
+      extensions::MimeHandlerViewGuest::FromRenderFrameHost(render_frame_host);
+  if (guest_view) {
+    guest_view->SetPluginCanSave(can_save);
+  }
+}

filename: shell/browser/electron_pdf_document_helper_client.h
patch: @@ -17,13 +17,12 @@ class ElectronPDFDocumentHelperClient : public pdf::PDFDocumentHelperClient {
 
  private:
   // pdf::PDFDocumentHelperClient
-
   void UpdateContentRestrictions(content::RenderFrameHost* render_frame_host,
                                  int content_restrictions) override;
   void OnPDFHasUnsupportedFeature(content::WebContents* contents) override {}
   void OnSaveURL(content::WebContents* contents) override {}
   void SetPluginCanSave(content::RenderFrameHost* render_frame_host,
-                        bool can_save) override {}
+                        bool can_save) override;
 };
 
 #endif  // ELECTRON_SHELL_BROWSER_ELECTRON_PDF_DOCUMENT_HELPER_CLIENT_H_