Add cc:DrawQuad type for surfaces

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index 52e217889d05007bf1f6074d014a460a31f5751e..d7e6b3dee84923e35364fa99c2572544fa8b143f 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -348,6 +348,11 @@ void GLRenderer::DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) {
     case DrawQuad::STREAM_VIDEO_CONTENT:
       DrawStreamVideoQuad(frame, StreamVideoDrawQuad::MaterialCast(quad));
       break;
+    case DrawQuad::SURFACE_CONTENT:
+      // Surface content should be fully resolved to other quad types before
+      // reaching a direct renderer.
+      NOTREACHED();
+      break;
     case DrawQuad::TEXTURE_CONTENT:
       EnqueueTextureQuad(frame, TextureDrawQuad::MaterialCast(quad));
       break;