cc: avoid redundant error report on android.

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 2238 matching lines @@
         resource_provider_.get(), settings_.use_distance_field_text,
         msaa_sample_count);
     return;
   }
 
   DCHECK(GetRendererCapabilities().using_image);
 
   bool use_zero_copy = settings_.use_zero_copy;
   // TODO(reveman): Remove this when mojo supports worker contexts.
   // crbug.com/522440
-  if (!worker_context_provider) {
+  if (!use_zero_copy && !worker_context_provider) {
     LOG(ERROR)
         << "Forcing zero-copy tile initialization as worker context is missing";
     use_zero_copy = true;
   }
 
   if (use_zero_copy) {
     *resource_pool = ResourcePool::CreateForGpuMemoryBufferResources(
         resource_provider_.get(), GetTaskRunner());
 
     *raster_buffer_provider = ZeroCopyRasterBufferProvider::Create(
@@ skipping 1759 matching lines @@
     const {
   return fixed_raster_scale_attempted_scale_change_history_.count() >=
          kFixedRasterScaleAttemptedScaleChangeThreshold;
 }
 
 void LayerTreeHostImpl::SetFixedRasterScaleAttemptedToChangeScale() {
   fixed_raster_scale_attempted_scale_change_history_.set(0);
 }
 
 }  // namespace cc