Change webkit/{fileapi,quota} code to use TaskRunner.

webkit/chromeos/fileapi/cros_mount_point_provider.cc

Index: webkit/chromeos/fileapi/cros_mount_point_provider.cc
diff --git a/webkit/chromeos/fileapi/cros_mount_point_provider.cc b/webkit/chromeos/fileapi/cros_mount_point_provider.cc
index e73516f936567b8219ba28fcb435c243df5a5d01..b7fecd66307ddcc0e324657208c26f0707f25a3b 100644
--- a/webkit/chromeos/fileapi/cros_mount_point_provider.cc
+++ b/webkit/chromeos/fileapi/cros_mount_point_provider.cc
@@ -8,9 +8,9 @@
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "base/message_loop_proxy.h"
 #include "base/stringprintf.h"
 #include "base/synchronization/lock.h"
+#include "base/task_runner.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebSecurityOrigin.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCString.h"
@@ -244,13 +244,24 @@ CrosMountPointProvider::CreateFileSystemOperation(
     const GURL& origin_url,
     fileapi::FileSystemType file_system_type,
     const FilePath& virtual_path,
-    base::MessageLoopProxy* file_proxy,
+    base::TaskRunner* task_runner,
     fileapi::FileSystemContext* context) const {
   const MountPoint* mount_point = GetMountPoint(virtual_path);
   if (mount_point && mount_point->location == REMOTE)
     return new chromeos::RemoteFileSystemOperation(mount_point->remote_proxy);
 
-  return new fileapi::FileSystemOperation(file_proxy, context);
+  return new fileapi::FileSystemOperation(task_runner, context);
+}
+
+webkit_blob::FileReader* CrosMountPointProvider::CreateFileReader(
+    const GURL& url,
+    int64 offset,
+    base::TaskRunner* task_runner,
+    fileapi::FileSystemContext* context) const {
+  // For now we return a generic Reader implementation which utilizes
+  // CreateSnapshotFile internally (i.e. will download everything first).
+  // TODO(satorux,zel): implement more efficient reader for remote cases.
+  return new fileapi::FileSystemFileReader(task_runner, context, url, offset);
 }
 
 webkit_blob::FileReader* CrosMountPointProvider::CreateFileReader(