Add an --enable-deferred-filters command-line flag.

content/public/common/content_switches.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 "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
 // have an effect. 0 disables MSAA.
@@ skipping 335 matching lines @@
 
 // Specifies if the |DOMAutomationController| needs to be bound in the
 // renderer. This binding happens on per-frame basis and hence can potentially
 // be a performance bottleneck. One should only enable it when automating dom
 // based tests.
 const char kDomAutomationController[]       = "dom-automation";
 
 // Enable gpu-accelerated SVG/W3C filters.
 const char kEnableAcceleratedFilters[]      = "enable-accelerated-filters";
 
+// Disable gpu-accelerated 2d canvas.
+const char kEnableDeferredFilters[]         = "enable-deferred-filters";

[piman, 2014/01/23 01:19:54]

nit: Can you add this to kForwardSwitches in
chrome/browser/chromeos/login/chrome_restart_request.cc so that it also applies
to chrome os guest mode?

+
 // Enables accelerated compositing for backgrounds of root layers with
 // background-attachment: fixed. Requires kForceCompositingMode.
 const char kEnableAcceleratedFixedRootBackground[] =
     "enable-accelerated-fixed-root-background";
 
 // Enables accelerated compositing for overflow scroll. Promotes eligible
 // overflow:scroll elements to layers to enable accelerated scrolling for them.
 const char kEnableAcceleratedOverflowScroll[] =
     "enable-accelerated-overflow-scroll";
 
@@ skipping 689 matching lines @@
 #endif
 
 #if defined(OS_POSIX)
 // Causes the child processes to cleanly exit via calling exit().
 const char kChildCleanExit[]                = "child-clean-exit";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches