OOP PDF: Override printing for MimeHandlerViewContainers.

components/printing/renderer/print_web_view_helper.h

Index: components/printing/renderer/print_web_view_helper.h
diff --git a/components/printing/renderer/print_web_view_helper.h b/components/printing/renderer/print_web_view_helper.h
index 3e8e573b6dd28c02c01392c8767ca5cf2df837d9..fca9258cef6bf226f1e1625755045066fb15efc2 100644
--- a/components/printing/renderer/print_web_view_helper.h
+++ b/components/printing/renderer/print_web_view_helper.h
@@ -79,6 +79,10 @@ class PrintWebViewHelper
     // Returns the element to be printed. Returns a null WebElement if
     // a pdf plugin element can't be extracted from the frame.
     virtual blink::WebElement GetPdfElement(blink::WebLocalFrame* frame) = 0;
+
+    // Returns true if printing is overridden and the default behavior should be
+    // skipped for |frame|.
+    virtual bool OverridePrint(blink::WebLocalFrame* frame) = 0;
   };
 
   PrintWebViewHelper(content::RenderView* render_view,