Defer request to print a PDF when the user initiates the entire frame and the PDF hasn't loaded.

pdf/instance.cc

Index: pdf/instance.cc
diff --git a/pdf/instance.cc b/pdf/instance.cc
index 9cb78294b090980824760b2b3a51dddeb026c48e..cda0c588a665b6a7d9579fa1770681d27461581d 100644
--- a/pdf/instance.cc
+++ b/pdf/instance.cc
@@ -1499,6 +1499,12 @@ void Instance::DocumentLoadComplete(int page_count) {
   DCHECK(document_load_state_ == LOAD_STATE_LOADING);
   document_load_state_ = LOAD_STATE_COMPLETE;
   UserMetricsRecordAction("PDF.LoadSuccess");
+
+  if (did_call_start_loading_) {
+    pp::PDF::DidStopLoading(this);
+    did_call_start_loading_ = false;
+  }
+
   if (on_load_callback_.is_string())
     ExecuteScript(on_load_callback_);
   // Note: If we are in print preview mode on_load_callback_ might call
@@ -1515,11 +1521,6 @@ void Instance::DocumentLoadComplete(int page_count) {
   if (!pp::PDF::IsAvailable())
     return;
 
-  if (did_call_start_loading_) {
-    pp::PDF::DidStopLoading(this);
-    did_call_start_loading_ = false;
-  }
-
   int content_restrictions =
       CONTENT_RESTRICTION_CUT | CONTENT_RESTRICTION_PASTE;
   if (!engine_->HasPermission(PDFEngine::PERMISSION_COPY))