Disable accelerated 2d canvas and put it back as an option in about:flags.

content/public/common/content_switches.h

 // Copyright (c) 2011 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.
 
 // Defines all the "content" command-line switches.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_
 #pragma once
 
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 
 namespace switches {
 
 CONTENT_EXPORT extern const char kAllowFileAccessFromFiles[];
 extern const char kAllowSandboxDebugging[];
 extern const char kAuditHandles[];
 extern const char kAuditAllHandles[];
 CONTENT_EXPORT extern const char kBrowserAssertTest[];
 CONTENT_EXPORT extern const char kBrowserCrashTest[];
 CONTENT_EXPORT extern const char kBrowserSubprocessPath[];
 // TODO(jam): this doesn't belong in content.
 CONTENT_EXPORT extern const char kChromeFrame[];
 CONTENT_EXPORT extern const char kDisable3DAPIs[];
-CONTENT_EXPORT extern const char kDisableAccelerated2dCanvas[];
 CONTENT_EXPORT extern const char kDisableAcceleratedCompositing[];
 CONTENT_EXPORT extern const char kDisableAcceleratedLayers[];
 CONTENT_EXPORT extern const char kDisableAcceleratedPlugins[];
 CONTENT_EXPORT extern const char kDisableAcceleratedVideo[];
 CONTENT_EXPORT extern const char kDisableAltWinstation[];
 CONTENT_EXPORT extern const char kDisableApplicationCache[];
 extern const char kDisableAudio[];
 extern const char kDisableBackingStoreLimit[];
 CONTENT_EXPORT extern const char kDisableDatabases[];
 extern const char kDisableDataTransferItems[];
@@ skipping 19 matching lines @@
 CONTENT_EXPORT extern const char kDisablePopupBlocking[];
 extern const char kDisableRendererAccessibility[];
 extern const char kDisableSSLFalseStart[];
 extern const char kDisableSeccompSandbox[];
 extern const char kDisableSessionStorage[];
 extern const char kDisableSharedWorkers[];
 CONTENT_EXPORT extern const char kDisableSpeechInput[];
 extern const char kDisableSpellcheckAPI[];
 CONTENT_EXPORT extern const char kDisableWebAudio[];
 extern const char kDisableWebSockets[];
-extern const char kEnableAccelerated2dCanvas[];
+CONTENT_EXPORT extern const char kEnableAccelerated2dCanvas[];
 CONTENT_EXPORT extern const char kEnableAcceleratedDrawing[];
 extern const char kEnableAccessibility[];
 extern const char kEnableAccessibilityLogging[];
 CONTENT_EXPORT extern const char kEnableDNSCertProvenanceChecking[];
 CONTENT_EXPORT extern const char kEnableDeviceMotion[];
 CONTENT_EXPORT extern const char kDisableFullScreen[];
 extern const char kEnableGPUPlugin[];
 CONTENT_EXPORT extern const char kEnableLogging[];
 extern const char kEnableMediaStream[];
 extern const char kEnableMonitorProfile[];
@@ skipping 87 matching lines @@
 extern const char kUseSystemSSL[];
 #endif
 
 #if !defined(OFFICIAL_BUILD)
 CONTENT_EXPORT extern const char kRendererCheckFalseTest[];
 #endif
 
 }  // namespace switches
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_SWITCHES_H_