Support copying a partial rectangle region from the compositing surface on Aura and GTK.

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index c375154a775c79addd934041d5485957659144b8..f08543709e5d8531def7bc8feb277fd6db2cd31e 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -1197,21 +1197,29 @@ BackingStore* RenderWidgetHostViewWin::AllocBackingStore(
 }
 
 void RenderWidgetHostViewWin::CopyFromCompositingSurface(
-    const gfx::Size& size,
+    const gfx::Rect& src_subrect,
+    const gfx::Size& dst_size,
     const base::Callback<void(bool)>& callback,
     skia::PlatformCanvas* output) {
   base::ScopedClosureRunner scoped_callback_runner(base::Bind(callback, false));
+  // TODO(mazda): Support copying a partial rectangle from the compositing
+  // surface with |src_subrect| (http://crbug.com/118571).
+  if (!src_subrect.IsEmpty()) {
+    NOTIMPLEMENTED();
+    return;
+  }
+
   if (!accelerated_surface_.get())
     return;
 
-  if (size.IsEmpty())
+  if (dst_size.IsEmpty())
     return;
 
-  if (!output->initialize(size.width(), size.height(), true))
+  if (!output->initialize(dst_size.width(), dst_size.height(), true))
     return;
 
   const bool result = accelerated_surface_->CopyTo(
-      size, output->getTopDevice()->accessBitmap(true).getPixels());
+      dst_size, output->getTopDevice()->accessBitmap(true).getPixels());
   scoped_callback_runner.Release();
   callback.Run(result);
 }