Revert of Re-land: cc: Use worker context for one-copy tile initialization.

cc/resources/resource_pool.cc

Index: cc/resources/resource_pool.cc
diff --git a/cc/resources/resource_pool.cc b/cc/resources/resource_pool.cc
index bb22b796e6be809997b3ee04cb7ee3df3fb3e412..23a62331f9d06db6d2d808b33f52578d7e6e1bde 100644
--- a/cc/resources/resource_pool.cc
+++ b/cc/resources/resource_pool.cc
@@ -187,11 +187,14 @@
   delete resource;
 }
 
-void ResourcePool::CheckBusyResources() {
+void ResourcePool::CheckBusyResources(bool wait_if_needed) {
   ResourceList::iterator it = busy_resources_.begin();
 
   while (it != busy_resources_.end()) {
     ScopedResource* resource = it->resource;
+
+    if (wait_if_needed)
+      resource_provider_->WaitReadLockIfNeeded(resource->id());
 
     if (resource_provider_->CanLockForWrite(resource->id())) {
       DidFinishUsingResource(resource, it->content_id);