Add GrabWindowSnapshotAsync tests

ui/snapshot/snapshot.h

 // Copyright (c) 2012 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_H_
 #define UI_SNAPSHOT_SNAPSHOT_H_
 
 #include <vector>
 
 #include "base/callback_forward.h"
@@ skipping 25 matching lines @@
 
 SNAPSHOT_EXPORT bool GrabViewSnapshot(
     gfx::NativeView view,
     std::vector<unsigned char>* png_representation,
     const gfx::Rect& snapshot_bounds);
 
 // GrabWindowSnapshotAsync() copies snapshot of |source_rect| from window and
 // scales it to |target_size| asynchronously.
 typedef base::Callback<void(const gfx::Image& snapshot)>
     GrabWindowSnapshotAsyncCallback;
 SNAPSHOT_EXPORT void GrabWindowSnapshotAsync(

[Sergey Ulanov, 2014/01/05 07:34:40]

Maybe rename this to GrabWindowSnapshotAndScaleAsync() to make it clear how it's
different from the new method below.

[enne (OOO), 2014/01/07 00:25:25]

Done.

     gfx::NativeWindow window,
     const gfx::Rect& source_rect,
     const gfx::Size& target_size,
     scoped_refptr<base::TaskRunner> background_task_runner,
     const GrabWindowSnapshotAsyncCallback& callback);
+SNAPSHOT_EXPORT void GrabWindowSnapshotAsync(
+    gfx::NativeWindow window,
+    const gfx::Rect& source_rect,
+    scoped_refptr<base::TaskRunner> background_task_runner,
+    const GrabWindowSnapshotAsyncCallback& callback);
 
 }  // namespace ui
 
 #endif  // UI_SNAPSHOT_SNAPSHOT_H_