Implement webview.captureVisibleRegion()

content/browser/compositor/surface_utils.h

Index: content/browser/compositor/surface_utils.h
diff --git a/content/browser/compositor/surface_utils.h b/content/browser/compositor/surface_utils.h
index b56fef2717070218c8d990c1bf901718e58ef5ab..00d0fd77bf66bb271961f06656e24395eca5a226 100644
--- a/content/browser/compositor/surface_utils.h
+++ b/content/browser/compositor/surface_utils.h
@@ -6,8 +6,12 @@
 #define CONTENT_BROWSER_COMPOSITOR_SURFACE_UTILS_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"
 
 namespace cc {
+class CopyOutputResult;
 class SurfaceIdAllocator;
 class SurfaceManager;
 }  // namespace cc
@@ -18,6 +22,12 @@ scoped_ptr<cc::SurfaceIdAllocator> CreateSurfaceIdAllocator();
 
 cc::SurfaceManager* GetSurfaceManager();
 
+void CopyFromCompositingSurfaceHasResult(
+    const gfx::Size& dst_size_in_pixel,
+    const SkColorType color_type,
+    const ReadbackRequestCallback& callback,
+    scoped_ptr<cc::CopyOutputResult> result);
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_SURFACE_UTILS_H_