Merge 92908 - Readback composited webgl results for printing

Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp

Index: Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp
===================================================================
--- Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp	(revision 93076)
+++ Source/WebCore/platform/graphics/opengl/GraphicsContext3DOpenGL.cpp	(working copy)
@@ -151,6 +151,12 @@
 }
 #endif
 
+bool GraphicsContext3D::paintCompositedResultsToCanvas(CanvasRenderingContext*)
+{
+    // Not needed at the moment, so return that nothing was done.
+    return false;
+}
+
 PassRefPtr<ImageData> GraphicsContext3D::paintRenderingResultsToImageData()
 {
     // Reading premultiplied alpha would involve unpremultiplying, which is