[Android] Implement WebSettings.setAppCache{Enabled|Path}

content/browser/android/content_settings.cc

Index: content/browser/android/content_settings.cc
diff --git a/content/browser/android/content_settings.cc b/content/browser/android/content_settings.cc
index f381672b00874500481a0eb9e365aa406c8f8a2c..afffba574b989a213dc1fe449146f8bd24008018 100644
--- a/content/browser/android/content_settings.cc
+++ b/content/browser/android/content_settings.cc
@@ -248,6 +248,9 @@ void ContentSettings::SyncFromNativeImpl() {
   Java_ContentSettings_setPluginsDisabled(env, obj, !prefs.plugins_enabled);
   CheckException(env);
 
+  // We don't need to sync AppCache settings to Java, because there are
+  // no getters for them in the API.
+
   env->SetBooleanField(
       obj,
       field_ids_->dom_storage_enabled,
@@ -351,6 +354,9 @@ void ContentSettings::SyncToNativeImpl() {
 
   prefs.plugins_enabled = !Java_ContentSettings_getPluginsDisabled(env, obj);
 
+  prefs.application_cache_enabled =
+      Java_ContentSettings_getAppCacheEnabled(env, obj);
+
   prefs.local_storage_enabled = env->GetBooleanField(
       obj, field_ids_->dom_storage_enabled);