Avoid sync IPCs for FileSystem API [chromium] (2/4)

chrome/renderer/worker_permission_client_proxy.cc

Index: chrome/renderer/worker_permission_client_proxy.cc
diff --git a/chrome/renderer/worker_permission_client_proxy.cc b/chrome/renderer/worker_permission_client_proxy.cc
index 7d8a65e87ea92419838ee79d97a2ed33ebdd0744..52573aa5bd0e51c433d59325ea00e7c93f112e79 100644
--- a/chrome/renderer/worker_permission_client_proxy.cc
+++ b/chrome/renderer/worker_permission_client_proxy.cc
@@ -7,6 +7,7 @@
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
 #include "ipc/ipc_sync_message_filter.h"
+#include "third_party/WebKit/public/platform/WebPermissionCallbacks.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
@@ -46,11 +47,41 @@ bool WorkerPermissionClientProxy::allowFileSystem() {
     return false;
 
   bool result = false;
-  sync_message_filter_->Send(new ChromeViewHostMsg_AllowFileSystem(
+  sync_message_filter_->Send(new ChromeViewHostMsg_RequestFileSystemAccessSync(
       routing_id_, document_origin_url_, top_frame_origin_url_, &result));
   return result;
 }
 
+bool WorkerPermissionClientProxy::requestFileSystemAccessSync() {
+  if (is_unique_origin_)
+    return false;
+
+  bool result = false;
+  sync_message_filter_->Send(new ChromeViewHostMsg_RequestFileSystemAccessSync(
+      routing_id_, document_origin_url_, top_frame_origin_url_, &result));
+  return result;
+}
+
+void WorkerPermissionClientProxy::requestFileSystemAccessAsync(
+    const blink::WebPermissionCallbacks& callbacks) {
+  bool result = false;
+
+  // There are two reasons the we still send a synchronized message here:
+  // 1. This function is called in blink's worker thread. Therefore, sending
+  // synchronized message will only block the worker's thread, but won't block
+  // the main thread.
+  // 2. The sync filesystem API requires blocking. Using an asynchronous IPC
+  // would introduce additional complexity to block the worker thread.
+  sync_message_filter_->Send(new ChromeViewHostMsg_RequestFileSystemAccessSync(
+      routing_id_, document_origin_url_, top_frame_origin_url_, &result));
+  blink::WebPermissionCallbacks permission_callbacks(callbacks);
+  if (result) {
+    permission_callbacks.doAllow();
+    return;
+  }
+  permission_callbacks.doDeny();
+}
+
 bool WorkerPermissionClientProxy::allowIndexedDB(
     const blink::WebString& name) {
   if (is_unique_origin_)