[Android] Implement asynchronous zero-copy bitmap capture API.

content/browser/renderer_host/render_widget_host_view_gtk.cc

Index: content/browser/renderer_host/render_widget_host_view_gtk.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.cc b/content/browser/renderer_host/render_widget_host_view_gtk.cc
index f246360699aa74bfc346e8fa8ea058fd3465c67c..8af0c74bfb4e829e32e4f8552399ecb1b9e152bf 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.cc
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.cc
@@ -1048,7 +1048,8 @@ void RenderWidgetHostViewGtk::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& /* dst_size */,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
-    SkBitmap::Config config) {
+    SkBitmap::Config config,
+    scoped_ptr<SkBitmap> bitmap) {
   if (config != SkBitmap::kARGB_8888_Config) {
     NOTIMPLEMENTED();
     callback.Run(false, SkBitmap());