cc: DCHECK background_image_id only if there is a background image

cc/output/gl_renderer.cc

 // Copyright 2010 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/output/gl_renderer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1047 matching lines @@
       // This function allocates a texture, which should contribute to the
       // amount of memory used by render surfaces:
       // LayerTreeHost::CalculateMemoryForRenderSurfaces.
       background_texture = GetBackdropTexture(background_rect);
 
       if (ShouldApplyBackgroundFilters(quad) && background_texture) {
         // Apply the background filters to R, so that it is applied in the
         // pixels' coordinate space.
         background_image = ApplyBackgroundFilters(
             frame, quad, background_texture.get(), gfx::RectF(background_rect));
-        if (background_image)
+        if (background_image) {
           background_image_id = skia::GrBackendObjectToGrGLTextureInfo(
                                     background_image->getTextureHandle(true))
                                     ->fID;
-        DCHECK(background_image_id);
+          DCHECK(background_image_id);
+        }
       }
     }
 
     if (!background_texture) {
       // Something went wrong with reading the backdrop.
       DCHECK(!background_image_id);
       use_shaders_for_blending = false;
     } else if (background_image_id) {
       // Reset original background texture if there is not any mask
       if (!quad->mask_resource_id())
@@ skipping 2603 matching lines @@
       texture_id = pending_overlay_resources_.back()->texture_id();
     }
 
     context_support_->ScheduleOverlayPlane(
         overlay.plane_z_order, overlay.transform, texture_id,
         ToNearestRect(overlay.display_rect), overlay.uv_rect);
   }
 }
 
 }  // namespace cc