Implement Worker-MainThread bridge for FileSystem API in Chrome

content/child/fileapi/webfilesystem_impl.h

Index: content/child/fileapi/webfilesystem_impl.h
diff --git a/content/child/fileapi/webfilesystem_impl.h b/content/child/fileapi/webfilesystem_impl.h
index 6ca0c5b83d13f90013465a5f00ae4bf6c1589bd9..90699b687f6b6e2c2e009361fc7c5bb919f69f76 100644
--- a/content/child/fileapi/webfilesystem_impl.h
+++ b/content/child/fileapi/webfilesystem_impl.h
@@ -7,8 +7,13 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
 #include "third_party/WebKit/public/platform/WebFileSystem.h"
 
+namespace base {
+class MessageLoopProxy;
+}
+
 namespace WebKit {
 class WebURL;
 class WebFileWriter;
@@ -19,8 +24,8 @@ namespace content {
 
 class WebFileSystemImpl : public WebKit::WebFileSystem {
  public:
-  WebFileSystemImpl();
-  virtual ~WebFileSystemImpl() { }
+  WebFileSystemImpl(base::MessageLoopProxy* main_thread_loop);
+  virtual ~WebFileSystemImpl();
 
   // WebFileSystem implementation.
   virtual void move(
@@ -66,6 +71,9 @@ class WebFileSystemImpl : public WebKit::WebFileSystem {
   virtual void createSnapshotFileAndReadMetadata(
       const WebKit::WebURL& path,
       WebKit::WebFileSystemCallbacks*);
+
+ private:
+  scoped_refptr<base::MessageLoopProxy> main_thread_loop_;
 };
 
 }  // namespace content