Factor DRP PreviewsState logic out of content

content/public/renderer/render_frame.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 231 matching lines @@
   virtual void EnsureMojoBuiltinsAreAvailable(
       v8::Isolate* isolate,
       v8::Local<v8::Context> context) = 0;
 
   // Adds |message| to the DevTools console.
   virtual void AddMessageToConsole(ConsoleMessageLevel level,
                                    const std::string& message) = 0;
   // 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;
 
   // Whether or not this frame is currently pasting.
   virtual bool IsPasting() const = 0;
 
   // Returns the current visibility of the frame.
   virtual blink::WebPageVisibilityState GetVisibilityState() const = 0;
 
@@ skipping 16 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class RenderFrameImpl;
   RenderFrame() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_