aw: Add command switch to disable hardware acceleration

android_webview/common/aw_switches.cc

 // Copyright 2014 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 "android_webview/common/aw_switches.h"
+#include "base/command_line.h"
 
 namespace switches {
 
 const char kDisableRecordDocumentWorkaround[] =
     "disable-record-document-workaround";
 
+const char kForceAuxiliaryBitmap[] = "force-auxiliary-bitmap";
+
+bool ForceAuxiliaryBitmap() {
+  static bool force_auxiliary_bitmap =
+      CommandLine::ForCurrentProcess()->HasSwitch(kForceAuxiliaryBitmap);
+  return force_auxiliary_bitmap;
+}
+
 }  // namespace switches