Consistently use LoFi for an entire page

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 "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
@@ skipping 137 matching lines @@
 
   // Ensures that builtin mojo bindings modules are available in |context|.
   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;
 
+  // Whether or not to use Lo-Fi for this frame.
+  virtual bool IsLoFiOn() = 0;
+
  protected:
   ~RenderFrame() override {}
 
  private:
   // This interface should only be implemented inside content.
   friend class RenderFrameImpl;
   RenderFrame() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_FRAME_H_