(not for review yet)

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index dda25ecb79ad4b24337fa6a00cda38c3bbd4b5e6..81c5ef794a005d36dfc6d427028a201c7853195e 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -685,6 +685,8 @@ void ThreadProxy::ScheduledActionSendBeginFrameToMainThread() {
       layer_tree_host_impl_->CurrentPhysicalTimeTicks();
   begin_frame_state->scroll_info =
       layer_tree_host_impl_->ProcessScrollDeltas();
+  begin_frame_state->ui_resource_eviction_count =
+      layer_tree_host_impl_->ui_resource_eviction_count();
 
   if (!layer_tree_host_impl_->settings().impl_side_painting) {
     DCHECK_GT(layer_tree_host_impl_->memory_allocation_limit_bytes(), 0u);
@@ -756,6 +758,8 @@ void ThreadProxy::BeginFrameOnMainThread(
         begin_frame_state->monotonic_frame_begin_time);
     layer_tree_host_->AnimateLayers(
         begin_frame_state->monotonic_frame_begin_time);
+    layer_tree_host_->SetUIResourceEvictionCountToAck(
+        begin_frame_state->ui_resource_eviction_count);
   }
 
   // Unlink any backings that the impl thread has evicted, so that we know to
@@ -1353,7 +1357,8 @@ size_t ThreadProxy::MaxPartialTextureUpdates() const {
 }
 
 ThreadProxy::BeginFrameAndCommitState::BeginFrameAndCommitState()
-    : memory_allocation_limit_bytes(0) {}
+    : memory_allocation_limit_bytes(0),
+      ui_resource_eviction_count(0) {}
 
 ThreadProxy::BeginFrameAndCommitState::~BeginFrameAndCommitState() {}