Do not give GPU memory to backgrounded compositors.

cc/output/managed_memory_policy.cc

Index: cc/output/managed_memory_policy.cc
diff --git a/cc/output/managed_memory_policy.cc b/cc/output/managed_memory_policy.cc
index ade2a27f9e4a0c442dcba940d7aadce22ac60824..049d2b03f9fcd14768e830c1c931d9a90ffc74da 100644
--- a/cc/output/managed_memory_policy.cc
+++ b/cc/output/managed_memory_policy.cc
@@ -16,37 +16,25 @@ 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;
 }