Plumb overlay processing into DirectRenderer.

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 55dafbd47d20e36196a8924b800c97cbbc9191db..156f0dafcbdd532f4851ea9e2e8f3a2211f87f76 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -1124,6 +1124,45 @@ void ResourceProvider::UnlockForWrite(ResourceId id) {
   resource->locked_for_write = false;
 }
 
+const ResourceProvider::Resource* ResourceProvider::LockForExport(
+    ResourceId id) {
+  Resource* resource = GetResource(id);
+  if (resource->type == GLTexture) {
+    DCHECK(resource->origin != Resource::Internal);
+    DCHECK(resource->mailbox.IsTexture());
+    GLES2Interface* gl = ContextGL();
+    DCHECK(gl);
+    if (resource->mailbox.sync_point()) {
+      GLC(gl, gl->WaitSyncPointCHROMIUM(resource->mailbox.sync_point()));
+      resource->mailbox.set_sync_point(0);
+    }
+  }
+
+  resource->exported_count++;
+  return resource;
+}
+
+void ResourceProvider::UnlockForExport(ResourceId id) {
+  Resource* resource = GetResource(id);
+  DCHECK_GT(resource->exported_count, 0);
+  resource->exported_count--;
+}
+
+ResourceProvider::ScopedExportLock::ScopedExportLock(
+    ResourceProvider* resource_provider,
+    ResourceProvider::ResourceId resource_id)
+    : resource_provider_(resource_provider), resource_id_(resource_id) {
+  resource_provider_->LockForExport(resource_id);
+}
+
+ResourceProvider::ScopedExportLock::~ScopedExportLock() {
+  resource_provider_->UnlockForExport(resource_id_);
+}
+
+const gpu::Mailbox& ResourceProvider::ScopedExportLock::GetMailbox() const {
+  return resource_provider_->GetResource(resource_id_)->mailbox.mailbox();
+}
+
 ResourceProvider::ScopedReadLockGL::ScopedReadLockGL(
     ResourceProvider* resource_provider,
     ResourceProvider::ResourceId resource_id)