cc: Keep track of busy resources in ResourcePool

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index 874fe3f641907df4c4e2b198316ce662d639b2a2..ce654f1f889bd16ea06727842e2e790f6b465218 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -258,6 +258,11 @@ bool ResourceProvider::IsLost(ResourceId id) {
   return resource->lost;
 }
 
+bool ResourceProvider::IsExported(ResourceId id) {
+  Resource* resource = GetResource(id);
+  return resource->exported_count > 0;
+}
+
 ResourceProvider::ResourceId ResourceProvider::CreateResource(
     gfx::Size size,
     GLint wrap_mode,
@@ -792,7 +797,8 @@ ResourceProvider::ResourceProvider(OutputSurface* output_surface,
                                    SharedBitmapManager* shared_bitmap_manager,
                                    int highp_threshold_min,
                                    bool use_rgba_4444_texture_format)
-    : output_surface_(output_surface),
+    : client_(NULL),
+      output_surface_(output_surface),
       shared_bitmap_manager_(shared_bitmap_manager),
       lost_output_surface_(false),
       highp_threshold_min_(highp_threshold_min),
@@ -808,6 +814,10 @@ ResourceProvider::ResourceProvider(OutputSurface* output_surface,
   DCHECK(output_surface_->HasClient());
 }
 
+void ResourceProvider::SetClient(ResourceProviderClient* client) {
+  client_ = client;
+}
+
 void ResourceProvider::InitializeSoftware() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK_NE(Bitmap, default_resource_type_);
@@ -924,7 +934,12 @@ void ResourceProvider::PrepareSendToParent(const ResourceIdArray& resources,
     TransferResource(context3d, *it, &resource);
     if (!resource.sync_point && !resource.is_software)
       need_sync_point = true;
-    ++resources_.find(*it)->second.exported_count;
+    ResourceMap::iterator resource_it = resources_.find(*it);
+    if (resource_it->second.exported_count == 0) {
+      if (client_)
+        client_->ResourceExported(*it);
+    }
+    ++resource_it->second.exported_count;
     list->push_back(resource);
   }
   if (need_sync_point) {
@@ -1092,6 +1107,10 @@ void ResourceProvider::ReceiveReturnsFromParent(
 
     CHECK_GE(resource->exported_count, returned.count);
     resource->exported_count -= returned.count;
+    if (resource->exported_count == 0) {
+      if (client_)
+        client_->ResourceReturned(local_id);
+    }
     resource->lost |= returned.lost;
     if (resource->exported_count)
       continue;