Add flag to disable impl-side painting

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/string_number_conversions.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "cc/switches.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/content_switches.h"
 #include "ui/base/ui_base_switches.h"
 
 namespace content {
 
 void SetContentCommandLineFlags(int max_render_process_count) {
   // May be called multiple times, to cover all possible program entry points.
   static bool already_initialized = false;
   if (already_initialized)
     return;
   already_initialized = true;
 
   CommandLine* parsed_command_line = CommandLine::ForCurrentProcess();
 
-  parsed_command_line->AppendSwitch(cc::switches::kEnableImplSidePainting);
-
   if (parsed_command_line->HasSwitch(switches::kRendererProcessLimit)) {
     std::string limit = parsed_command_line->GetSwitchValueASCII(
         switches::kRendererProcessLimit);
     int value;
     if (base::StringToInt(limit, &value))
       max_render_process_count = value;
   }
 
   if (max_render_process_count <= 0) {
     // Need to ensure the command line flag is consistent as a lot of chrome
@@ skipping 28 matching lines @@
 
   // Always use fixed layout and viewport tag.
   parsed_command_line->AppendSwitch(switches::kEnableFixedLayout);
   parsed_command_line->AppendSwitch(switches::kEnableViewport);
 
   parsed_command_line->AppendSwitch(
       cc::switches::kEnableCompositorFrameMessage);
 }
 
 }  // namespace content