Add logic to GLRenderer to support RenderPassDrawQuad copying.

cc/resources/resource_pool.h

Index: cc/resources/resource_pool.h
diff --git a/cc/resources/resource_pool.h b/cc/resources/resource_pool.h
index ab13feebdac43ec72802f8d4be886a738e35b499..57ce119ab10d775d638ed15afd2ccfa2b30ec01c 100644
--- a/cc/resources/resource_pool.h
+++ b/cc/resources/resource_pool.h
@@ -56,6 +56,11 @@ class CC_EXPORT ResourcePool : public base::trace_event::MemoryDumpProvider {
   // valid). Updates the resource's content ID to its new value.
   void OnContentReplaced(ResourceId resource_id, uint64_t content_id);
   void ReleaseResource(Resource* resource);
+  void ReleaseResource(ResourceId resource_id);

[ccameron, 2016/07/20 22:13:53]

[These changes then end up not being needed]

It's true, it's bizarre that we have ResourceId, ScopedResource, and Resource
... should be cleaned up sometime.

+
+  // Similar to ReleaseResource, but does nothing if the resource did not come
+  // from this pool.
+  void ReleaseResourceIfFound(ResourceId resource_id);
 
   void SetResourceUsageLimits(size_t max_memory_usage_bytes,
                               size_t max_resource_count);