********** Chromium Blob hacking

content/common/fileapi/file_system_messages.h

Index: content/common/fileapi/file_system_messages.h
===================================================================
--- content/common/fileapi/file_system_messages.h	(revision 171309)
+++ content/common/fileapi/file_system_messages.h	(working copy)
@@ -35,6 +35,10 @@
                      int /* request_id */,
                      base::PlatformFileInfo,
                      FilePath /* true platform path, where possible */)
+IPC_MESSAGE_CONTROL3(FileSystemMsg_DidCreateSnapshotFile,
+                     int /* request_id */,
+                     base::PlatformFileInfo,
+                     FilePath /* true platform path */)
 IPC_MESSAGE_CONTROL3(FileSystemMsg_DidReadDirectory,
                      int /* request_id */,
                      std::vector<base::FileUtilProxy::Entry> /* entries */,
@@ -112,7 +116,7 @@
 IPC_MESSAGE_CONTROL4(FileSystemHostMsg_Write,
                      int /* request id */,
                      GURL /* file path */,
-                     GURL /* blob URL */,
+                     std::string /* blob UUID */,
                      int64 /* position */)
 
 // WebFileWriter::truncate() message.
@@ -144,11 +148,16 @@
                      GURL /* file path */)
 
 // WebFileSystem::createSnapshotFileAndReadMetadata() message.
-IPC_MESSAGE_CONTROL3(FileSystemHostMsg_CreateSnapshotFile,
+IPC_MESSAGE_CONTROL2(FileSystemHostMsg_CreateSnapshotFile,
                      int /* request_id */,
-                     GURL /* blob_url */,
                      GURL /* file_path */)
 
+// Renderers are expected to send this message after having processed
+// the FileSystemMsg_DidCreateSnapshotFile message. In particular,
+// after having created a BlobDataHandle backed by the snapshot file.
+IPC_MESSAGE_CONTROL1(FileSystemHostMsg_DidReceiveSnapshotFile,
+                     int /* request_id */)
+
 // For Pepper's URL loader.
 IPC_SYNC_MESSAGE_CONTROL1_1(FileSystemHostMsg_SyncGetPlatformPath,
                             GURL /* file path */,