Implement CreateFile() for GData file system.

This CL is the last piece for implementing the File API
getFile(..., {create: true}, ...) for GDataFileSytem.

Currently the file creation is implemented as uploading of
an empty file to the server. The Drive server assigns the
resource_id, and further read or write operation just
treats it as a non-pinned file (e.g., when it is read or
written it is downloaded to GCache/v1/tmp/<resource_id>.<md5>).

BUG=132968
TEST=Manual test.
1) Be sure prerequisites patches (10636053, 10656043, and 10556003) are applied.
2) Edit image files on Google Drive folder by photo editor, and with "overwrite original" unchecked)
3) Verify a new file is created on the Drive.

Review URL: https://chromiumcodereview.appspot.com/10568012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@144898 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 13 insertions, 1 deletions

diff --git a/webkit/chromeos/fileapi/remote_file_system_operation.cc b/webkit/chromeos/fileapi/remote_file_system_operation.cc
index d481f05..cfe457e 100644
--- a/webkit/chromeos/fileapi/remote_file_system_operation.cc
+++ b/webkit/chromeos/fileapi/remote_file_system_operation.cc
@@ -80,7 +80,10 @@ void RemoteFileSystemOperation::CreateDirectory(
 void RemoteFileSystemOperation::CreateFile(const FileSystemURL& url,
                                            bool exclusive,
                                            const StatusCallback& callback) {
-  NOTIMPLEMENTED();
+  DCHECK(SetPendingOperationType(kOperationCreateFile));
+  remote_proxy_->CreateFile(url, exclusive,
+      base::Bind(&RemoteFileSystemOperation::DidFinishFileOperation,
+                 base::Owned(this), callback));
 }
 
 void RemoteFileSystemOperation::Copy(const FileSystemURL& src_url,
diff --git a/webkit/chromeos/fileapi/remote_file_system_proxy.h b/webkit/chromeos/fileapi/remote_file_system_proxy.h
index fbe3149..b62c036 100644
--- a/webkit/chromeos/fileapi/remote_file_system_proxy.h
+++ b/webkit/chromeos/fileapi/remote_file_system_proxy.h
@@ -62,6 +62,15 @@ class RemoteFileSystemProxyInterface :
       bool recursive,
       const FileSystemOperationInterface::StatusCallback& callback) = 0;
 
+  // Creates a file at |url|. If the flag |is_exclusive| is true, an
+  // error is raised when a file already exists at the path. It is
+  // an error if a directory or a hosted document is already present at the
+  // path, or the parent directory of the path is not present yet.
+  virtual void CreateFile(
+      const FileSystemURL& url,
+      bool exclusive,
+      const FileSystemOperationInterface::StatusCallback& callback) = 0;
+
   // Changes the length of an existing file at |url| to |length|. If |length|
   // is negative, an error is raised. If |length| is more than the current size
   // of the file, zero is padded for the extended part.