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Fix draggable region update with BackForwardCache enabled (see issue #2421)

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When BackForwardCache is enabled and the user navigates the main frame
back/forward a new RFH may be created for an existing main frame GlobalId value
and CefFrameHostImpl (e.g. an object that was previously Detach()ed after main
frame navigation called SetMainFrame, but for which RenderFrameDeleted was not
subsequently called due to insertion in the BackForwardCache). In this case we
can re-attach the new RFH to the existing main frame CefFrameHostImpl in
RenderFrameHostStateChanged and resume processing of messages.

Swapping back/forward to an existing (already loaded) renderer does not trigger
new notifications for draggable regions (e.g. RenderFrameObserver::
DraggableRegionsChanged is not called by default). We therefore explicitly
request an update of draggable regions by sending the DidStopLoading message to
the renderer.

A new |reattached| parameter is added to CefFrameHandler::OnFrameAttached to
support identification of BackForwardCache usage by the client.

To test with unit tests:
Run `ceftests --gtest_filter=DraggableRegionsTest.DraggableRegionsCrossOrigin
              --enable-features=BackForwardCache`

To test manually:
1. Run `cefclient --enable-features=BackForwardCache --use-views
   --url=http://tests/draggable`, note that draggable regions work.
2. Load https://www.google.com via the address bar, note that draggable regions
   are removed.
3. Go back to http://tests/draggable, note that draggable regions work.
4. Go forward to https://www.google.com, note that draggable regions are
   removed.
This commit is contained in:
Marshall Greenblatt
2021-09-15 14:40:08 +03:00
parent b3f5d7dd59
commit 7a56371b84
13 changed files with 261 additions and 76 deletions
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8
libcef/browser/frame_host_impl.h
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@@ -119,6 +119,12 @@ class CefFrameHostImpl : public CefFrame, public cef::mojom::BrowserFrame {
// if this was the first call to Detach() for the frame.
bool Detach();
// A frame has swapped to active status from prerendering or the back-forward
// cache. We may need to re-attach if the RFH has changed. See
// https://crbug.com/1179502#c8 for additional background.
void MaybeReAttach(scoped_refptr<CefBrowserInfo> browser_info,
content::RenderFrameHost* render_frame_host);
// cef::mojom::BrowserFrame methods forwarded from CefBrowserFrame.
void SendMessage(const std::string& name, base::Value arguments) override;
void FrameAttached() override;
@@ -153,6 +159,8 @@ class CefFrameHostImpl : public CefFrame, public cef::mojom::BrowserFrame {
void SendToRenderFrame(const std::string& function_name,
RenderFrameAction action);
void FrameAttachedInternal(bool reattached);
const bool is_main_frame_;
// The following members may be read/modified from any thread. All access must