[devtools] Support different encodings for Page.CaptureScreenshot.

ui/snapshot/snapshot_async.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_SNAPSHOT_SNAPSHOT_ASYNC_H_
 #define UI_SNAPSHOT_SNAPSHOT_ASYNC_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 14 matching lines @@
 // ui::GrabWindowSnapshot callback.
 class SnapshotAsync {
  public:
   static void ScaleCopyOutputResult(
       const GrabWindowSnapshotAsyncCallback& callback,
       const gfx::Size& target_size,
       scoped_refptr<base::TaskRunner> background_task_runner,
       std::unique_ptr<cc::CopyOutputResult> result);
 
   static void EncodeCopyOutputResult(
-      const GrabWindowSnapshotAsyncPNGCallback& callback,
+      const GrabWindowSnapshotAsyncEncodedCallback& callback,
       scoped_refptr<base::TaskRunner> background_task_runner,
+      SnapshotEncoding encoding,
+      SnapshotQuality quality,
       std::unique_ptr<cc::CopyOutputResult> result);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(SnapshotAsync);
 };
 
 }  // namespace ui
 
 #endif  // UI_SNAPSHOT_SNAPSHOT_ASYNC_H_