Make MediaFileUtil run on thread pool.

webkit/fileapi/file_system_file_util_proxy.h

Index: webkit/fileapi/file_system_file_util_proxy.h
diff --git a/webkit/fileapi/file_system_file_util_proxy.h b/webkit/fileapi/file_system_file_util_proxy.h
index c1d71dff0ac0f67b957163ae8359cb3720d64295..d57536109dd7cff39fa28c6eb9618402d9716117 100644
--- a/webkit/fileapi/file_system_file_util_proxy.h
+++ b/webkit/fileapi/file_system_file_util_proxy.h
@@ -50,7 +50,7 @@ class FileSystemFileUtilProxy {
            FileSystemFileUtil::SnapshotFilePolicy snapshot_policy)>
       SnapshotFileCallback;
 
-  // Deletes a file or a directory on the given context's file_task_runner.
+  // Deletes a file or a directory on the given context's task_runner.
   // It is an error to delete a non-empty directory with recursive=false.
   static bool Delete(
       FileSystemOperationContext* context,
@@ -60,7 +60,7 @@ class FileSystemFileUtilProxy {
       const StatusCallback& callback);
 
   // Creates or opens a file with the given flags by calling |file_util|'s
-  // CreateOrOpen method on the given context's file_task_runner.
+  // CreateOrOpen method on the given context's task_runner.
   static bool CreateOrOpen(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
@@ -70,7 +70,7 @@ class FileSystemFileUtilProxy {
 
   // Copies a file or a directory from |src_url| to |dest_url| by calling
   // FileSystemFileUtil's following methods on the given context's
-  // file_task_runner.
+  // task_runner.
   // - CopyOrMoveFile() for same-filesystem operations
   // - CopyInForeignFile() for (limited) cross-filesystem operations
   //
@@ -91,7 +91,7 @@ class FileSystemFileUtilProxy {
 
   // Moves a file or a directory from |src_url| to |dest_url| by calling
   // FileSystemFileUtil's following methods on the given context's
-  // file_task_runner.
+  // task_runner.
   // - CopyOrMoveFile() for same-filesystem operations
   // - CopyInForeignFile() for (limited) cross-filesystem operations
   //
@@ -105,7 +105,7 @@ class FileSystemFileUtilProxy {
       const StatusCallback& callback);
 
   // Ensures that the given |url| exist by calling |file_util|'s
-  // EnsureFileExists method on the given context's file_task_runner.
+  // EnsureFileExists method on the given context's task_runner.
   static bool EnsureFileExists(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
@@ -113,7 +113,7 @@ class FileSystemFileUtilProxy {
       const EnsureFileExistsCallback& callback);
 
   // Creates directory at a given url by calling |file_util|'s
-  // CreateDirectory method on the given context's file_task_runner.
+  // CreateDirectory method on the given context's task_runner.
   static bool CreateDirectory(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
@@ -123,7 +123,7 @@ class FileSystemFileUtilProxy {
       const StatusCallback& callback);
 
   // Retrieves the information about a file by calling |file_util|'s
-  // GetFileInfo method on the given context's file_task_runner.
+  // GetFileInfo method on the given context's task_runner.
   static bool GetFileInfo(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
@@ -131,7 +131,7 @@ class FileSystemFileUtilProxy {
       const GetFileInfoCallback& callback);
 
   // Creates a snapshot file by calling |file_util|'s CreateSnapshotFile
-  // method on the given context's file_task_runner.
+  // method on the given context's task_runner.
   static bool CreateSnapshotFile(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
@@ -139,7 +139,7 @@ class FileSystemFileUtilProxy {
       const SnapshotFileCallback& callback);
 
   // Reads the filenames in |url| by calling |file_util|'s
-  // ReadDirectory method on the given context's file_task_runner.
+  // ReadDirectory method on the given context's task_runner.
   // TODO: this should support returning entries in multiple chunks.
   static bool ReadDirectory(
       FileSystemOperationContext* context,
@@ -148,7 +148,7 @@ class FileSystemFileUtilProxy {
       const ReadDirectoryCallback& callback);
 
   // Touches a file by calling |file_util|'s Touch method
-  // on the given context's file_task_runner.
+  // on the given context's task_runner.
   static bool Touch(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,
@@ -158,7 +158,7 @@ class FileSystemFileUtilProxy {
       const StatusCallback& callback);
 
   // Truncates a file to the given length by calling |file_util|'s
-  // Truncate method on the given context's file_task_runner.
+  // Truncate method on the given context's task_runner.
   static bool Truncate(
       FileSystemOperationContext* context,
       FileSystemFileUtil* file_util,