Factor DRP PreviewsState logic out of content

content/public/renderer/render_frame.h

Index: content/public/renderer/render_frame.h
diff --git a/content/public/renderer/render_frame.h b/content/public/renderer/render_frame.h
index a1b8056ce25c24414fea0d651d17b3d9127e0b65..b1b4a18ed67cfc49f9a465ef781f6ab705eba6d6 100644
--- a/content/public/renderer/render_frame.h
+++ b/content/public/renderer/render_frame.h
@@ -249,6 +249,10 @@ class CONTENT_EXPORT RenderFrame : public IPC::Listener,
   // Forcefully detaches all connected DevTools clients.
   virtual void DetachDevToolsForTest() = 0;
 
+  // Sets the PreviewsState of this frame, a bitmask of potentially several
+  // Previews optimizations.
+  virtual void SetPreviewsState(PreviewsState previews_state) = 0;
+
   // Returns the PreviewsState of this frame, a bitmask of potentially several
   // Previews optimizations.
   virtual PreviewsState GetPreviewsState() const = 0;