OOP PDF: Override printing for MimeHandlerViewContainers.

chrome/renderer/printing/chrome_print_web_view_helper_delegate.cc

Index: chrome/renderer/printing/chrome_print_web_view_helper_delegate.cc
diff --git a/chrome/renderer/printing/chrome_print_web_view_helper_delegate.cc b/chrome/renderer/printing/chrome_print_web_view_helper_delegate.cc
index 131555763cfb3035acbf923f5adc617e2a659968..f2141875bced39b4fecb0cee156be60dd74a1ca9 100644
--- a/chrome/renderer/printing/chrome_print_web_view_helper_delegate.cc
+++ b/chrome/renderer/printing/chrome_print_web_view_helper_delegate.cc
@@ -4,9 +4,13 @@
 
 #include "chrome/renderer/printing/chrome_print_web_view_helper_delegate.h"
 
+#include <vector>
+
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/prerender/prerender_helper.h"
+#include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
+#include "extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h"
 #include "ipc/ipc_message.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebElement.h"
@@ -48,3 +52,20 @@ blink::WebElement ChromePrintWebViewHelperDelegate::GetPdfElement(
 #endif  // defined(ENABLE_EXTENSIONS)
   return blink::WebElement();
 }
+
+bool ChromePrintWebViewHelperDelegate::OverridePrint(
+    blink::WebLocalFrame* frame) {
+  if (!frame->document().isPluginDocument())
+    return false;
+
+  std::vector<extensions::MimeHandlerViewContainer*> mime_handlers =
+      extensions::MimeHandlerViewContainer::FromRenderFrame(
+          content::RenderFrame::FromWebFrame(frame));
+  if (mime_handlers.empty())
+    return false;
+
+  base::DictionaryValue message;

[raymes, 2015/01/22 00:58:57]

Please add a comment here with a link to the PDF code where this is handled and
make a note of what this does, that it is particularly for PDF integration.

[Sam McNally, 2015/01/22 03:23:29]

Done.

+  message.SetString("type", "print");
+  mime_handlers.front()->PostMessageFromValue(message);
+  return true;
+}