pdf: Create a separate component for using the pdf pepper plugin.

chrome/renderer/pepper/chrome_pdf_print_delegate.cc

Index: chrome/renderer/pepper/chrome_pdf_print_delegate.cc
diff --git a/chrome/renderer/pepper/chrome_pdf_print_delegate.cc b/chrome/renderer/pepper/chrome_pdf_print_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..59e692bd0bbe1bc86ad6e7c78384652ce11f70d1
--- /dev/null
+++ b/chrome/renderer/pepper/chrome_pdf_print_delegate.cc
@@ -0,0 +1,50 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/renderer/pepper/chrome_pdf_print_delegate.h"
+
+#include "chrome/renderer/printing/print_web_view_helper.h"
+#include "content/public/renderer/pepper_plugin_instance.h"
+#include "content/public/renderer/render_view.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "third_party/WebKit/public/web/WebElement.h"
+#include "third_party/WebKit/public/web/WebLocalFrame.h"
+#include "third_party/WebKit/public/web/WebPluginContainer.h"
+
+namespace {
+
+blink::WebElement GetWebElement(PP_Instance instance_id) {
+  content::PepperPluginInstance* instance =
+      content::PepperPluginInstance::Get(instance_id);
+  if (!instance)
+    return blink::WebElement();
+  return instance->GetContainer()->element();
+}
+
+printing::PrintWebViewHelper* GetPrintWebViewHelper(
+    const blink::WebElement& element) {
+  if (element.isNull())
+    return NULL;
+  blink::WebView* view = element.document().frame()->view();
+  content::RenderView* render_view = content::RenderView::FromWebView(view);
+  return printing::PrintWebViewHelper::Get(render_view);
+}
+
+}  // namespace
+
+ChromePDFPrintDelegate::ChromePDFPrintDelegate() {}
+ChromePDFPrintDelegate::~ChromePDFPrintDelegate() {}
+
+bool ChromePDFPrintDelegate::IsPrintingEnabled(PP_Instance instance_id) {
+  blink::WebElement element = GetWebElement(instance_id);
+  printing::PrintWebViewHelper* helper = GetPrintWebViewHelper(element);

[raymes, 2014/08/27 03:34:09]

nit: looks like the above two lines are always called together, so you could
just combine them and have
printing::PrintWebViewHelper* helper = GetPrintWebViewHelper(instance_id)

[sadrul, 2014/08/27 11:49:57]

|element| is actually used below for PrintNode too (line 49).

+  return helper && helper->IsPrintingEnabled();
+}
+
+void ChromePDFPrintDelegate::Print(PP_Instance instance_id) {
+  blink::WebElement element = GetWebElement(instance_id);
+  printing::PrintWebViewHelper* helper = GetPrintWebViewHelper(element);
+  if (helper)
+    helper->PrintNode(element);
+}