localStorage: Aggressively flush to disk for Android WebView.

android_webview/lib/main/aw_main_delegate.cc

Index: android_webview/lib/main/aw_main_delegate.cc
diff --git a/android_webview/lib/main/aw_main_delegate.cc b/android_webview/lib/main/aw_main_delegate.cc
index 27e5da957fbf6b3581b35cb7eda3a1d2dcc709fa..3e0a6e82fd08083f19ee9fcb7df1f96f0866a29b 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -90,6 +90,11 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   // 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.
+  // http://crbug.com/479767
+  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