Disable force compositing mode when disabling compositing, re-enter in DoDeferredUpdate

webkit/glue/webpreferences.cc

 // 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.
 
 #include "webkit/glue/webpreferences.h"
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNetworkStateNotifier.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebRuntimeFeatures.h"
@@ skipping 330 matching lines @@
   // Display visualization of what has changed on the screen using an
   // overlay of rects, if requested on the command line.
   settings->setShowPaintRects(show_paint_rects);
 
   // Set whether to throttle framerate to Vsync.
   settings->setRenderVSyncEnabled(render_vsync_enabled);
 
   // Enable gpu-accelerated compositing if requested on the command line.
   settings->setAcceleratedCompositingEnabled(accelerated_compositing_enabled);
 
-  // Always enter compositing if requested on the command line.
-  settings->setForceCompositingMode(force_compositing_mode);
-
   // Enable compositing for fixed position elements if requested
   // on the command line.
   settings->setAcceleratedCompositingForFixedPositionEnabled(
       fixed_position_compositing_enabled);
 
   // Enable gpu-accelerated 2d canvas if requested on the command line.
   settings->setAccelerated2dCanvasEnabled(accelerated_2d_canvas_enabled);
 
   // Enable deferred 2d canvas if requested on the command line.
   settings->setDeferred2dCanvasEnabled(deferred_2d_canvas_enabled);
@@ skipping 75 matching lines @@
   settings->setFixedPositionCreatesStackingContext(
       fixed_position_creates_stacking_context);
 
   settings->setApplyPageScaleFactorInCompositor(
       apply_page_scale_factor_in_compositor);
 
   WebNetworkStateNotifier::setOnLine(is_online);
 }
 
 }  // namespace webkit_glue