android: Migrate old content readback to use async readback (and delegated renderer)

content/browser/android/content_startup_flags.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/browser/android/content_startup_flags.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 75 matching lines @@
   parsed_command_line->AppendSwitch(switches::kEnableViewportMeta);
   parsed_command_line->AppendSwitch(
       switches::kMainFrameResizesAreOrientationChanges);
 
   // Disable anti-aliasing.
   parsed_command_line->AppendSwitch(
       cc::switches::kDisableCompositedAntialiasing);
 
   parsed_command_line->AppendSwitch(switches::kUIPrioritizeInGpuProcess);
 
+  parsed_command_line->AppendSwitch(switches::kEnableDelegatedRenderer);
+
   if (!plugin_descriptor.empty()) {
     parsed_command_line->AppendSwitchNative(
       switches::kRegisterPepperPlugins, plugin_descriptor);
   }
 
   // Disable profiler timing by default.
   if (!parsed_command_line->HasSwitch(switches::kProfilerTiming)) {
     parsed_command_line->AppendSwitchASCII(
         switches::kProfilerTiming, switches::kProfilerTimingDisabledValue);
   }
 }
 
 }  // namespace content