Bug 1222083 - verify that a Skia GL context is actually available before trying to use it in Canvas2D drawImage. r=jmuizelaar

--HG--
extra : rebase_source : 2ddd185d711bc5cbdee08747b2fcc58a66719306

dom/canvas/CanvasRenderingContext2D.cpp

@@ -4402,6 +4402,7 @@ CanvasRenderingContext2D::DrawImage(const CanvasImageSource& image,
 
 #ifdef USE_SKIA_GPU
   if (mRenderingMode == RenderingMode::OpenGLBackendMode &&
+      mIsSkiaGL &&
       !srcSurf &&
       image.IsHTMLVideoElement() &&
       gfxPlatform::GetPlatform()->GetSkiaGLGlue()) {