Implement webview.captureVisibleRegion()

content/browser/readback_request_helpers.h

Index: content/browser/readback_request_helpers.h
diff --git a/content/browser/readback_request_helpers.h b/content/browser/readback_request_helpers.h
new file mode 100644
index 0000000000000000000000000000000000000000..e1a873c85c1a00b8fc0e6ba65d0f7134330a7349
--- /dev/null
+++ b/content/browser/readback_request_helpers.h
@@ -0,0 +1,47 @@
+// Copyright 2016 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 CONTENT_BROWSER_READBACK_REQUEST_HELPERS_H_
+#define CONTENT_BROWSER_READBACK_REQUEST_HELPERS_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "content/public/browser/readback_types.h"
+#include "third_party/skia/include/core/SkImageInfo.h"
+#include "ui/gfx/geometry/size.h"
+
+class SkAutoLockPixels;
+class SkBitmap;
+
+namespace cc {
+class CopyOutputResult;
+class SingleReleaseCallback;
+}
+
+namespace content {
+
+void CopyFromCompositingSurfaceFinished(
+    const ReadbackRequestCallback& callback,
+    scoped_ptr<cc::SingleReleaseCallback> release_callback,
+    scoped_ptr<SkBitmap> bitmap,
+    scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock,
+    bool result);
+
+void PrepareTextureCopyOutputResult(const gfx::Size& dst_size_in_pixel,
+                                    const SkColorType color_type,
+                                    const ReadbackRequestCallback& callback,
+                                    scoped_ptr<cc::CopyOutputResult> result);
+
+void PrepareBitmapCopyOutputResult(const gfx::Size& dst_size_in_pixel,
+                                   const SkColorType preferred_color_type,
+                                   const ReadbackRequestCallback& callback,
+                                   scoped_ptr<cc::CopyOutputResult> result);
+
+void CopyFromCompositingSurfaceHasResult(
+    const gfx::Size& dst_size_in_pixel,
+    const SkColorType color_type,
+    const ReadbackRequestCallback& callback,
+    scoped_ptr<cc::CopyOutputResult> result);
+}
+
+#endif  // CONTENT_BROWSER_READBACK_REQUEST_HELPERS_H_