Back out r31572, reinstating r31563:

Always create BackingStore CGLayers using the owner view's window's context as
a reference.

Reorganize CGLayer and CGBitmapContext creation into common functions.

BUG=26989
TEST=Still paints?  Good.
Review URL: http://codereview.chromium.org/384011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31578 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 13 insertions, 0 deletions

diff --git a/chrome/browser/renderer_host/backing_store.h b/chrome/browser/renderer_host/backing_store.h
index 6278884..8130498 100644
--- a/chrome/browser/renderer_host/backing_store.h
+++ b/chrome/browser/renderer_host/backing_store.h
@@ -105,6 +105,19 @@ class BackingStore {
                   const gfx::Size& view_size);
 
  private:
+#if defined(OS_MACOSX)
+  // Creates a CGLayer associated with its owner view's window's graphics
+  // context, sized properly for the backing store.  Returns NULL if the owner
+  // is not in a window with a CGContext.  cg_layer_ is assigned this method's
+  // result.
+  CGLayerRef CreateCGLayer();
+
+  // Creates a CGBitmapContext sized properly for the backing store.  The
+  // owner view need not be in a window.  cg_bitmap_ is assigned this method's
+  // result.
+  CGContextRef CreateCGBitmapContext();
+#endif
+
   // The owner of this backing store.
   RenderWidgetHost* render_widget_host_;