Do not give GPU memory to backgrounded compositors.

cc/output/managed_memory_policy.cc

 // Copyright 2013 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/managed_memory_policy.h"
 
 #include "base/logging.h"
 #include "cc/resources/priority_calculator.h"
 
 namespace cc {
 
 const size_t ManagedMemoryPolicy::kDefaultNumResourcesLimit = 10 * 1000 * 1000;
 
 using gpu::MemoryAllocation;
 
 ManagedMemoryPolicy::ManagedMemoryPolicy(size_t bytes_limit_when_visible)
     : bytes_limit_when_visible(bytes_limit_when_visible),
       priority_cutoff_when_visible(MemoryAllocation::CUTOFF_ALLOW_EVERYTHING),
-      bytes_limit_when_not_visible(0),
-      priority_cutoff_when_not_visible(MemoryAllocation::CUTOFF_ALLOW_NOTHING),
       num_resources_limit(kDefaultNumResourcesLimit) {}
 
 ManagedMemoryPolicy::ManagedMemoryPolicy(
     const gpu::MemoryAllocation& allocation)
     : bytes_limit_when_visible(allocation.bytes_limit_when_visible),
       priority_cutoff_when_visible(allocation.priority_cutoff_when_visible),
-      bytes_limit_when_not_visible(allocation.bytes_limit_when_not_visible),
-      priority_cutoff_when_not_visible(
-          allocation.priority_cutoff_when_not_visible),
       num_resources_limit(kDefaultNumResourcesLimit) {}
 
 ManagedMemoryPolicy::ManagedMemoryPolicy(
     size_t bytes_limit_when_visible,
     MemoryAllocation::PriorityCutoff priority_cutoff_when_visible,
-    size_t bytes_limit_when_not_visible,
-    MemoryAllocation::PriorityCutoff priority_cutoff_when_not_visible,
     size_t num_resources_limit)
     : bytes_limit_when_visible(bytes_limit_when_visible),
       priority_cutoff_when_visible(priority_cutoff_when_visible),
-      bytes_limit_when_not_visible(bytes_limit_when_not_visible),
-      priority_cutoff_when_not_visible(priority_cutoff_when_not_visible),
       num_resources_limit(num_resources_limit) {}
 
 bool ManagedMemoryPolicy::operator==(const ManagedMemoryPolicy& other) const {
   return bytes_limit_when_visible == other.bytes_limit_when_visible &&
          priority_cutoff_when_visible == other.priority_cutoff_when_visible &&
-         bytes_limit_when_not_visible == other.bytes_limit_when_not_visible &&
-         priority_cutoff_when_not_visible ==
-             other.priority_cutoff_when_not_visible &&
          num_resources_limit == other.num_resources_limit;
 }
 
 bool ManagedMemoryPolicy::operator!=(const ManagedMemoryPolicy& other) const {
   return !(*this == other);
 }
 
 // static
 int ManagedMemoryPolicy::PriorityCutoffToValue(
     MemoryAllocation::PriorityCutoff priority_cutoff) {
@@ skipping 23 matching lines @@
     case MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE:
       return ALLOW_PREPAINT_ONLY;
     case MemoryAllocation::CUTOFF_ALLOW_EVERYTHING:
       return ALLOW_ANYTHING;
   }
   NOTREACHED();
   return ALLOW_NOTHING;
 }
 
 }  // namespace cc