remove DCHECK for resourceless software allowing more than one render pass.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1002 matching lines @@
     UMA_HISTOGRAM_COUNTS(
         "Compositing.RenderPass.AppendQuadData."
         "CheckerboardedNoRecordingContentArea",
         checkerboarded_no_recording_content_area);
     UMA_HISTOGRAM_COUNTS(
         "Compositing.RenderPass.AppendQuadData."
         "CheckerboardedNeedRasterContentArea",
         checkerboarded_needs_raster_content_area);
   }
 
-  // Should only have one render pass in resourceless software mode.
-  DCHECK(draw_mode != DRAW_MODE_RESOURCELESS_SOFTWARE ||
-         frame->render_passes.size() == 1u)
-      << frame->render_passes.size();
-
   TRACE_EVENT_END2("cc", "LayerTreeHostImpl::CalculateRenderPasses",
                    "draw_result", draw_result, "missing tiles",
                    num_missing_tiles);
 
   // Draw has to be successful to not drop the copy request layer.
   // When we have a copy request for a layer, we need to draw even if there
   // would be animating checkerboards, because failing under those conditions
   // triggers a new main frame, which may cause the copy request layer to be
   // destroyed.
   // TODO(weiliangc): Test copy request w/ CompositorFrameSink recreation. Would
@@ skipping 3122 matching lines @@
       worker_context_visibility_ =
           worker_context->CacheController()->ClientBecameVisible();
     } else {
       worker_context->CacheController()->ClientBecameNotVisible(
           std::move(worker_context_visibility_));
     }
   }
 }
 
 }  // namespace cc