localStorage: Aggressively flush to disk for Android WebView.

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 "android_webview/browser/aw_content_browser_client.h"
 #include "android_webview/browser/browser_view_renderer.h"
 #include "android_webview/browser/scoped_allow_wait_for_legacy_web_view_api.h"
 #include "android_webview/crash_reporter/aw_microdump_crash_reporter.h"
@@ skipping 72 matching lines @@
   // WebRTC hardware decoding is not supported, internal bug 15075307
   cl->AppendSwitch(switches::kDisableWebRtcHWDecoding);
   cl->AppendSwitch(switches::kDisableAcceleratedVideoDecode);
 
   // This is needed for sharing textures across the different GL threads.
   cl->AppendSwitch(switches::kEnableThreadedTextureMailboxes);
 
   // WebView does not yet support screen orientation locking.
   cl->AppendSwitch(switches::kDisableScreenOrientationLock);
 
+  // WebView does not (yet) save Chromium data during shutdown, so add setting
+  // for Chrome to aggressively persist DOM Storage to minimize data loss.

[michaeln, 2015/05/07 23:19:03]

might be nice to put the link to the android specific crbug here instead of in
the more widely used content lib file

[cmumford, 2015/05/08 16:02:48]

Done.

+  cl->AppendSwitch(switches::kEnableAggressiveDOMStorageFlushing);
+
   // This is needed to be able to mmap the V8 snapshot and ICU data file
   // directly from the WebView .apk.
   // This needs to be here so that it gets to run before the code in
   // content_main_runner that reads these values tries to do so.
   // In multi-process mode this code would live in
   // AwContentBrowserClient::GetAdditionalMappedFilesForChildProcess.
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 #ifdef __LP64__
   const char kNativesFileName[] = "natives_blob_64.bin";
   const char kSnapshotFileName[] = "snapshot_blob_64.bin";
@@ skipping 91 matching lines @@
 #if defined(VIDEO_HOLE)
 content::ExternalVideoSurfaceContainer*
 AwMainDelegate::CreateExternalVideoSurfaceContainer(
     content::WebContents* web_contents) {
   return external_video_surface::ExternalVideoSurfaceContainerImpl::Create(
       web_contents);
 }
 #endif
 
 }  // namespace android_webview