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 d9cbab894a92f23ccad759f53f18d84dc4bf68ed..defb379388d38ac57af7a52be47e51c9e7262a70 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