Add a switch to invert web contents (non-accel only).

content/renderer/render_widget.h

 // Copyright (c) 2012 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_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 #pragma once
 
 #include <deque>
 #include <vector>
@@ skipping 215 matching lines @@
       int selection_end);
   virtual void OnImeConfirmComposition(
       const string16& text, const ui::Range& replacement_range);
   void OnMsgPaintAtSize(const TransportDIB::Handle& dib_id,
                         int tag,
                         const gfx::Size& page_size,
                         const gfx::Size& desired_size);
   void OnMsgRepaint(const gfx::Size& size_to_paint);
   void OnSetTextDirection(WebKit::WebTextDirection direction);
   void OnGetFPS();
+  void OnInvertWebContent(bool invert);
 
   // Override points to notify derived classes that a paint has happened.
   // WillInitiatePaint happens when we're about to generate a new bitmap and
   // send it to the browser. DidInitiatePaint happens when that has completed,
   // and subsequent rendering won't affect the painted content. DidFlushPaint
   // happens once we've received the ACK that the screen has been updated.
   // For a given paint operation, these overrides will always be called in the
   // order WillInitiatePaint, DidInitiatePaint, DidFlushPaint.
   virtual void WillInitiatePaint() {}
   virtual void DidInitiatePaint() {}
@@ skipping 242 matching lines @@
   // pass state between DoDeferredUpdate and OnSwapBuffersPosted.
   scoped_ptr<ViewHostMsg_UpdateRect_Params> pending_update_params_;
 
   // Queue of UpdateRect messages corresponding to a SwapBuffers. We want to
   // delay sending of UpdateRect until the corresponding SwapBuffers has been
   // executed. Since we can have several in flight, we need to keep them in a
   // queue. Note: some SwapBuffers may not correspond to an update, in which
   // case NULL is added to the queue.
   std::deque<ViewHostMsg_UpdateRect*> updates_pending_swap_;
 
+  // Set to true if we should invert all pixels.
+  bool invert_;
+
+  // The Skia paint object for inverting.
+  scoped_ptr<SkPaint> invert_paint_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_