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This CL propagates the initiator origin via `content::DragDownloadFile::DragDownloadFileUI::InitiateDownload` into `download::DownloadUrlParameters::set_initiator`. Note that the initiator origin comes from trustworthy, browser-side data: - `RenderFrameHostImpl::StartDragging` passes `GetLastCommittedOrigin()` into `RenderViewHostDelegateView::StartDragging` - `WebContentsViewAura::StartDragging` stores the origin into into `ui::OSExchangeDataProviderFactory` using a call to `ui::OSExchangeDataProviderFactory::MarkRendererTaintedFromOrigin`. On Windows this CL takes the origin from `OSExchangeDataProviderFactory` and passes it directly into `DragDownloadFile`'s constructor. - `WebContentsViewMac::StartDragging` ends up storing the origin in `WebDragSource` from `web_drag_source_mac.mm`. On Mac this CL takes this origin and also passes it (indirectly, via mojo) into `DragDownloadFile`'s constructor. @lukasza has manually tested this CL on Windows using the repro steps from https://crbug.com/40060358 (@dcheng has kindly tried the repro steps on Mac). Note that `DragDownloadFile` is used on Windows and Mac, but not on Linux (i.e. the repro wouldn't have worked on Linux). Fixed: 40060358 Change-Id: I24b180473e140cbb8a56640444f2f4a306aa42fc Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5692867 Reviewed-by: Daniel Cheng <dcheng@chromium.org> Reviewed-by: Avi Drissman <avi@chromium.org> Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org> Cr-Commit-Position: refs/heads/main@{#1327773}
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