Add printing tests to ensure window.print() works for subframes.

chrome/browser/printing/print_view_manager.cc

Index: chrome/browser/printing/print_view_manager.cc
diff --git a/chrome/browser/printing/print_view_manager.cc b/chrome/browser/printing/print_view_manager.cc
index 6afd07b443725b2bb3b55f195554bbb458a5b643..feb28ddb8b18249723bfcd7e0324647e5ecab714 100644
--- a/chrome/browser/printing/print_view_manager.cc
+++ b/chrome/browser/printing/print_view_manager.cc
@@ -54,11 +54,13 @@ void EnableInternalPDFPluginForContents(int render_process_id,
 
 namespace printing {
 
+bool PrintViewManager::TestDelegate::ScriptedPrint(
+    const content::RenderFrameHost* render_frame_host) {
+  return true;
+}
+
 PrintViewManager::PrintViewManager(content::WebContents* web_contents)
-    : PrintViewManagerBase(web_contents),
-      print_preview_state_(NOT_PREVIEWING),
-      print_preview_rfh_(nullptr),
-      scripted_print_preview_rph_(nullptr) {
+    : PrintViewManagerBase(web_contents) {
   if (PrintPreviewDialogController::IsPrintPreviewDialog(web_contents)) {
     EnableInternalPDFPluginForContents(
         web_contents->GetRenderProcessHost()->GetID(),
@@ -200,6 +202,11 @@ void PrintViewManager::OnSetupScriptedPrintPreview(
     return;
   }
 
+  if (test_delegate_ && !test_delegate_->ScriptedPrint(rfh)) {
+    rfh->Send(reply_msg);
+    return;
+  }
+
   DCHECK(!print_preview_rfh_);
   print_preview_rfh_ = rfh;
   print_preview_state_ = SCRIPTED_PREVIEW;
@@ -210,7 +217,6 @@ void PrintViewManager::OnSetupScriptedPrintPreview(
 
 void PrintViewManager::OnShowScriptedPrintPreview(content::RenderFrameHost* rfh,
                                                   bool source_is_modifiable) {
-  DCHECK(print_preview_rfh_);
   if (rfh != print_preview_rfh_)
     return;
 
@@ -250,4 +256,8 @@ bool PrintViewManager::OnMessageReceived(
          PrintViewManagerBase::OnMessageReceived(message, render_frame_host);
 }
 
+void PrintViewManager::SetTestDelegate(TestDelegate* delegate) {
+  test_delegate_ = delegate;
+}
+
 }  // namespace printing