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

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 00ae766155f380cb6f9ec597dd5b8575d7791b36..ee8c9829a47efe159a48b69a71cee85063cca499 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1176,6 +1176,18 @@ void LayerTreeHostImpl::UpdateTileManagerMemoryPolicy(
           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