cc: Free gpu resources when we are invisible or TM is oom.

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 <algorithm>
 #include <limits>
 #include <map>
 
@@ skipping 1158 matching lines @@
          settings_.max_memory_for_prepaint_percentage) /
         100;
   }
   global_tile_state_.memory_limit_policy =
       ManagedMemoryPolicy::PriorityCutoffToTileMemoryLimitPolicy(
           visible_ ?
           policy.priority_cutoff_when_visible :
           gpu::MemoryAllocation::CUTOFF_ALLOW_NOTHING);
   global_tile_state_.num_resources_limit = policy.num_resources_limit;
 
+  if (use_gpu_rasterization_ &&

[vmiura, 2015/04/02 19:12:34]

nit: I think this would be easier to understand that it's either Zero or Default
--

if (use_gpu_rasterization_ && rasterizer_) {
  if (!visible_ || global_tile_state_.hard_memory_limit_in_bytes == 0)
    rasterizer_->SetZeroMemoryLimit();
  else
    rasterizer_->SetDefaultMemoryLimit();
}

[sohanjg, 2015/04/08 09:00:31]

Done.

+      (!visible_ || global_tile_state_.hard_memory_limit_in_bytes == 0)) {
+    if (rasterizer_)
+      rasterizer_->SetZeroMemoryLimit();
+  }
+
+  if (use_gpu_rasterization_ &&
+      (visible_ && global_tile_state_.hard_memory_limit_in_bytes > 0)) {
+    if (rasterizer_)
+      rasterizer_->SetDefaultMemoryLimit();
+  }
+
   // TODO(reveman): We should avoid keeping around unused resources if
   // possible. crbug.com/224475
   // Unused limit is calculated from soft-limit, as hard-limit may
   // be very high and shouldn't typically be exceeded.
   size_t unused_memory_limit_in_bytes = static_cast<size_t>(
       (static_cast<int64>(global_tile_state_.soft_memory_limit_in_bytes) *
        settings_.max_unused_resource_memory_percentage) /
       100);
 
   DCHECK(resource_pool_);
@@ skipping 2227 matching lines @@
   new_target.SetToMin(layer_impl->MaxScrollOffset());
 
   curve->UpdateTarget(
       animation->TrimTimeToCurrentIteration(CurrentBeginFrameArgs().frame_time)
           .InSecondsF(),
       new_target);
 
   return true;
 }
 }  // namespace cc