localStorage: Aggressively flush to disk for Android WebView.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index fcb540c3318fcf859bd1631eb39534b1fb94a34b..a760f07e3c725f12c42b16193be6f2fab71b56a4 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -23,6 +23,7 @@
 #include "base/trace_event/trace_event.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/device_sensors/device_inertial_sensor_service.h"
+#include "content/browser/dom_storage/dom_storage_area.h"
 #include "content/browser/download/save_file_manager.h"
 #include "content/browser/gamepad/gamepad_service.h"
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
@@ -573,6 +574,13 @@ void BrowserMainLoop::MainMessageLoopStart() {
     base::MessageLoop::current()->AddTaskObserver(memory_observer_.get());
   }
 
+  if (parsed_command_line_.HasSwitch(
+          switches::kEnableAggressiveDOMStorageFlushing)) {
+    TRACE_EVENT0("startup",
+                 "BrowserMainLoop::Subsystem:EnableAggressiveCommitDelay");
+    DOMStorageArea::EnableAggressiveCommitDelay();
+  }
+
 #if defined(TCMALLOC_TRACE_MEMORY_SUPPORTED)
   trace_memory_controller_.reset(new base::trace_event::TraceMemoryController(
       base::MessageLoop::current()->message_loop_proxy(),