Implement async version of WebFileSystem::createFileWriter

To cleanup callback chain in Blink side.

The interface is introduced in r154035

Corresponding blink patch: https://codereview.chromium.org/18411005/

BUG=257349
TEST=no behavioral changes
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/18427005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@211359 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 34 insertions, 0 deletions

diff --git a/content/child/fileapi/webfilesystem_impl.cc b/content/child/fileapi/webfilesystem_impl.cc
index 69057aa..9bb8664 100644
--- a/content/child/fileapi/webfilesystem_impl.cc
+++ b/content/child/fileapi/webfilesystem_impl.cc
@@ -24,6 +24,23 @@ using WebKit::WebVector;
 
 namespace content {
 
+namespace {
+
+void DidReadMetadataForCreateFileWriter(
+    const GURL& path,
+    WebKit::WebFileWriterClient* client,
+    WebKit::WebFileSystemCallbacks* callbacks,
+    const base::PlatformFileInfo& file_info) {
+  if (file_info.is_directory || file_info.size < 0) {
+    callbacks->didFail(WebKit::WebFileErrorInvalidState);
+    return;
+  }
+  callbacks->didCreateFileWriter(new WebFileWriterImpl(path, client),
+                                 file_info.size);
+}
+
+}  // namespace
+
 WebFileSystemImpl::WebFileSystemImpl() {
 }
 
@@ -130,6 +147,19 @@ WebKit::WebFileWriter* WebFileSystemImpl::createFileWriter(
   return new WebFileWriterImpl(GURL(path), client);
 }
 
+void WebFileSystemImpl::createFileWriter(
+    const WebURL& path,
+    WebKit::WebFileWriterClient* client,
+    WebKit::WebFileSystemCallbacks* callbacks) {
+  FileSystemDispatcher* dispatcher =
+      ChildThread::current()->file_system_dispatcher();
+  dispatcher->ReadMetadata(
+      GURL(path),
+      base::Bind(&DidReadMetadataForCreateFileWriter,
+                 GURL(path), client, callbacks),
+      base::Bind(&FileStatusCallbackAdapter, callbacks));
+}
+
 void WebFileSystemImpl::createSnapshotFileAndReadMetadata(
     const WebKit::WebURL& path,
     WebKit::WebFileSystemCallbacks* callbacks) {
diff --git a/content/child/fileapi/webfilesystem_impl.h b/content/child/fileapi/webfilesystem_impl.h
index 2bcf535..6ca0c5b 100644
--- a/content/child/fileapi/webfilesystem_impl.h
+++ b/content/child/fileapi/webfilesystem_impl.h
@@ -59,6 +59,10 @@ class WebFileSystemImpl : public WebKit::WebFileSystem {
       WebKit::WebFileSystemCallbacks*) OVERRIDE;
   virtual WebKit::WebFileWriter* createFileWriter(
       const WebKit::WebURL& path, WebKit::WebFileWriterClient*) OVERRIDE;
+  virtual void createFileWriter(
+      const WebKit::WebURL& path,
+      WebKit::WebFileWriterClient*,
+      WebKit::WebFileSystemCallbacks*) OVERRIDE;
   virtual void createSnapshotFileAndReadMetadata(
       const WebKit::WebURL& path,
       WebKit::WebFileSystemCallbacks*);