[M56 fork] Disable webview async ondraw

android_webview/lib/main/aw_main_delegate.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 "android_webview/lib/main/aw_main_delegate.h"
 
 #include <memory>
 
 #include "android_webview/browser/aw_content_browser_client.h"
 #include "android_webview/browser/browser_view_renderer.h"
@@ skipping 48 matching lines @@
 }
 
 AwMainDelegate::~AwMainDelegate() {
 }
 
 bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   content::SetContentClient(&content_client_);
 
   base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
 
+  // Temporarily disable async ondraw for M56.
+  cl->AppendSwitch(switches::kSyncOnDrawHardware);
+
   // WebView uses the Android system's scrollbars and overscroll glow.
   cl->AppendSwitch(switches::kDisableOverscrollEdgeEffect);
 
   // Pull-to-refresh should never be a default WebView action.
   cl->AppendSwitch(switches::kDisablePullToRefreshEffect);
 
   // Not yet supported in single-process mode.
   cl->AppendSwitch(switches::kDisableSharedWorkers);
 
   // File system API not supported (requires some new API; internal bug 6930981)
@@ skipping 184 matching lines @@
 
 AwWebPreferencesPopulater* AwMainDelegate::CreateWebPreferencesPopulater() {
   return new AwWebPreferencesPopulaterImpl();
 }
 
 AwLocaleManager* AwMainDelegate::CreateAwLocaleManager() {
   return new AwLocaleManagerImpl();
 }
 
 }  // namespace android_webview