Add Print Selection support to Chrome. This change is fairly involved since ...

chrome/renderer/render_view.cc

Index: chrome/renderer/render_view.cc
===================================================================
--- chrome/renderer/render_view.cc	(revision 18804)
+++ chrome/renderer/render_view.cc	(working copy)
@@ -339,6 +339,7 @@
   IPC_BEGIN_MESSAGE_MAP(RenderView, message)
     IPC_MESSAGE_HANDLER(ViewMsg_CaptureThumbnail, SendThumbnail)
     IPC_MESSAGE_HANDLER(ViewMsg_PrintPages, OnPrintPages)
+    IPC_MESSAGE_HANDLER(ViewMsg_PrintingDone, OnPrintingDone)
     IPC_MESSAGE_HANDLER(ViewMsg_Navigate, OnNavigate)
     IPC_MESSAGE_HANDLER(ViewMsg_Stop, OnStop)
     IPC_MESSAGE_HANDLER(ViewMsg_LoadAlternateHTMLText, OnLoadAlternateHTMLText)
@@ -454,6 +455,15 @@
   }
 }
 
+void RenderView::OnPrintingDone(int document_cookie, bool success) {
+  // Ignoring document cookie here since only one print job can be outstanding
+  // per renderer and document_cookie is 0 when printing is successful.
+  DCHECK(print_helper_.get());
+  if (print_helper_.get() != NULL) {
+    print_helper_->DidFinishPrinting(success);
+  }
+}
+
 void RenderView::CapturePageInfo(int load_id, bool preliminary_capture) {
   if (load_id != page_id_)
     return;  // this capture call is no longer relevant due to navigation
@@ -2217,9 +2227,10 @@
 }
 
 void RenderView::ScriptedPrint(WebFrame* frame) {
-  print_render_view_.reset(new PrintWebViewHelper(this));
-  print_render_view_->SyncPrint(frame);
-  print_render_view_.reset();
+  if (print_helper_.get() == NULL) {
+    print_helper_.reset(new PrintWebViewHelper(this));
+  }
+  print_helper_->SyncPrint(frame);
 }
 
 void RenderView::WebInspectorOpened(int num_resources) {