Move gpu memory calculations to Compositor.

cc/trees/layer_tree_settings.cc

Index: cc/trees/layer_tree_settings.cc
diff --git a/cc/trees/layer_tree_settings.cc b/cc/trees/layer_tree_settings.cc
index 414abb3fab35f8cb4257ea3675f6f0cf91b90012..c079ef9db9d2181a27edbb0097abc93d5a3945b6 100644
--- a/cc/trees/layer_tree_settings.cc
+++ b/cc/trees/layer_tree_settings.cc
@@ -69,7 +69,10 @@ LayerTreeSettings::LayerTreeSettings()
       image_decode_tasks_enabled(false),
       use_compositor_animation_timelines(false),
       wait_for_beginframe_interval(true),
-      max_staging_buffer_usage_in_bytes(32 * 1024 * 1024) {}
+      max_staging_buffer_usage_in_bytes(32 * 1024 * 1024),
+      memory_policy_(64 * 1024 * 1024,
+                     gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING,
+                     ManagedMemoryPolicy::kDefaultNumResourcesLimit) {}
 
 LayerTreeSettings::~LayerTreeSettings() {}