Update from https://crrev.com/318214

cc/resources/one_copy_tile_task_worker_pool.cc

 // Copyright 2014 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/resources/one_copy_tile_task_worker_pool.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/strings/stringprintf.h"
@@ skipping 60 matching lines @@
   scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> lock_;
   CopySequenceNumber sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(RasterBufferImpl);
 };
 
 // Flush interval when performing copy operations.
 const int kCopyFlushPeriod = 4;
 
 // Number of in-flight copy operations to allow.
-const int kMaxCopyOperations = 16;
+const int kMaxCopyOperations = 32;
 
 // Delay been checking for copy operations to complete.
 const int kCheckForCompletedCopyOperationsTickRateMs = 1;
 
 // Number of failed attempts to allow before we perform a check that will
 // wait for copy operations to complete if needed.
 const int kFailedAttemptsBeforeWaitIfNeeded = 256;
 
 }  // namespace
 
@@ skipping 406 matching lines @@
                             resource_pool_->total_memory_usage_bytes());
   staging_state->SetInteger("pending_copy_count",
                             resource_pool_->total_resource_count() -
                                 resource_pool_->acquired_resource_count());
   staging_state->SetInteger("bytes_pending_copy",
                             resource_pool_->total_memory_usage_bytes() -
                                 resource_pool_->acquired_memory_usage_bytes());
 }
 
 }  // namespace cc