Fix crashes when NinePatchLayer doesn't have a resource.

cc/layers/nine_patch_layer_impl.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/nine_patch_layer_impl.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "cc/layers/quad_sink.h"
 #include "cc/quads/texture_draw_quad.h"
@@ skipping 46 matching lines @@
 
 bool NinePatchLayerImpl::WillDraw(DrawMode draw_mode,
                                   ResourceProvider* resource_provider) {
   if (!resource_id_ || draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
     return false;
   return LayerImpl::WillDraw(draw_mode, resource_provider);
 }
 
 void NinePatchLayerImpl::AppendQuads(QuadSink* quad_sink,
                                      AppendQuadsData* append_quads_data) {
-  DCHECK(resource_id_);
-
   SharedQuadState* shared_quad_state =
       quad_sink->UseSharedQuadState(CreateSharedQuadState());
   AppendDebugBorderQuad(quad_sink, shared_quad_state, append_quads_data);
 
+  if (!resource_id_)
+    return;
+
   static const bool flipped = false;
   static const bool premultiplied_alpha = true;
 
   DCHECK(!bounds().IsEmpty());
 
   // NinePatch border widths in bitmap pixel space
   int left_width = image_aperture_.x();
   int top_height = image_aperture_.y();
   int right_width = image_bounds_.width() - image_aperture_.right();
   int bottom_height = image_bounds_.height() - image_aperture_.bottom();
@@ skipping 213 matching lines @@
 
   list = new base::ListValue;
   list->AppendInteger(image_bounds_.width());
   list->AppendInteger(image_bounds_.height());
   result->Set("ImageBounds", list);
 
   return result;
 }
 
 }  // namespace cc