Adding functionality to print PDF embedded in the html page.

chrome/renderer/print_web_view_helper.cc

 // Copyright (c) 2011 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/print_web_view_helper.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 925 matching lines @@
 
 void PrintWebViewHelper::OnPrintingDone(bool success) {
   notify_browser_of_print_failure_ = false;
   if (!success)
     LOG(ERROR) << "Failure in OnPrintingDone";
   DidFinishPrinting(success ? OK : FAIL_PRINT);
 }
 
 void PrintWebViewHelper::OnPrintNodeUnderContextMenu() {
   const WebNode& context_menu_node = render_view()->GetContextMenuNode();
-  if (context_menu_node.isNull()) {
+  PrintNode(context_menu_node);
+}
+
+void PrintWebViewHelper::OnInitiatePrintPreview() {
+  DCHECK(is_preview_enabled_);
+  WebFrame* frame;
+  if (GetPrintFrame(&frame)) {
+    print_preview_context_.InitWithFrame(frame);
+    RequestPrintPreview();
+  }
+}
+
+void PrintWebViewHelper::PrintNode(const WebNode& node) {
+  if (node.isNull()) {
     NOTREACHED();
     return;
   }
 
   // Make a copy of the node, in case RenderView::OnContextMenuClosed resets
   // its |context_menu_node_|.
   if (is_preview_enabled_) {
-    print_preview_context_.InitWithNode(context_menu_node);
+    print_preview_context_.InitWithNode(node);
     RequestPrintPreview();
   } else {
-    WebNode duplicate_node(context_menu_node);
+    WebNode duplicate_node(node);
     Print(duplicate_node.document().frame(), duplicate_node);
   }
 }
 
-void PrintWebViewHelper::OnInitiatePrintPreview() {
-  DCHECK(is_preview_enabled_);
-  WebFrame* frame;
-  if (GetPrintFrame(&frame)) {
-    print_preview_context_.InitWithFrame(frame);
-    RequestPrintPreview();
-  }
-}
-
 void PrintWebViewHelper::Print(WebKit::WebFrame* frame,
                                const WebKit::WebNode& node) {
   // If still not finished with earlier print request simply ignore.
   if (print_web_view_)
     return;
 
   // Initialize print settings.
   scoped_ptr<PrepareFrameAndViewForPrint> prepare;
   if (!InitPrintSettingsAndPrepareFrame(frame, node, &prepare)) {
     DidFinishPrinting(FAIL_PRINT);
@@ skipping 744 matching lines @@
   DCHECK(IsRendering());
   return prep_frame_view_->GetPrintCanvasSize();
 }
 
 void PrintWebViewHelper::PrintPreviewContext::ClearContext() {
   prep_frame_view_.reset();
   metafile_.reset();
   pages_to_render_.clear();
   error_ = PREVIEW_ERROR_NONE;
 }