Add a "Simplify Page" option to the print preview dialog

chrome/browser/ui/webui/print_preview/print_preview_handler.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
index 237bba967a6013be8075d1ae87087d520386b79e..eb42f2507ed7b6fe6f67cc762389ad6269fd8f1e 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -30,6 +30,7 @@
 #include "base/values.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/dom_distiller/tab_utils.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/printing/print_dialog_cloud.h"
 #include "chrome/browser/printing/print_error_dialog.h"
@@ -57,6 +58,7 @@
 #include "components/cloud_devices/common/cloud_device_description.h"
 #include "components/cloud_devices/common/cloud_devices_urls.h"
 #include "components/cloud_devices/common/printer_description.h"
+#include "components/dom_distiller/core/url_utils.h"
 #include "components/printing/common/print_messages.h"
 #include "components/signin/core/browser/gaia_cookie_manager_service.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
@@ -165,6 +167,8 @@ const char kHidePrintWithSystemDialogLink[] = "hidePrintWithSystemDialogLink";
 #endif
 // Name of a dictionary field holding the state of selection for document.
 const char kDocumentHasSelection[] = "documentHasSelection";
+// Dictionary field indicating whether to simplify the page.
+const char kPrintFriendlyEnabled[] = "printFriendlyEnabled";
 
 // Id of the predefined PDF printer.
 const char kLocalPdfPrinterId[] = "Save as PDF";
@@ -823,8 +827,24 @@ void PrintPreviewHandler::HandleGetPreview(const base::ListValue* args) {
   }
 
   VLOG(1) << "Print preview request start";
-  RenderViewHost* rvh = initiator->GetRenderViewHost();
-  rvh->Send(new PrintMsg_PrintPreview(rvh->GetRoutingID(), *settings));
+
+  bool print_friendly = false;
+  if (!settings->GetBoolean(printing::kSettingPrintFriendlyEnabled,
+                            &print_friendly)) {
+    NOTREACHED();
+  }
+
+  if (print_friendly) {
+    if (!hidden_print_preview_)
+      MaybeStartDistillation(initiator);
+
+      hidden_print_preview_.reset(
+        new HiddenPrintPreview(initiator, print_preview_ui()));
+      hidden_print_preview_->SetSettings(settings.Pass());
+  } else {
+    RenderViewHost* rvh = initiator->GetRenderViewHost();
+    rvh->Send(new PrintMsg_PrintPreview(rvh->GetRoutingID(), *settings));
+  }
 }
 
 void PrintPreviewHandler::HandlePrint(const base::ListValue* args) {
@@ -1237,6 +1257,15 @@ void PrintPreviewHandler::SendInitialSettings(
   initial_settings.SetBoolean(kHidePrintWithSystemDialogLink, is_ash);
 #endif
 
+  WebContents* initiator = GetInitiator();
+  bool can_simplify = false;
+  if (initiator) {
+      can_simplify = cmdline->HasSwitch(switches::kEnableDomDistiller) &&
+         dom_distiller::url_utils::IsUrlDistillable(
+            initiator->GetLastCommittedURL());
+    }
+  initial_settings.SetBoolean(kPrintFriendlyEnabled, can_simplify);
+
   if (print_preview_ui()->source_is_modifiable())
     GetNumberFormatAndMeasurementSystem(&initial_settings);
   web_ui()->CallJavascriptFunction("setInitialSettings", initial_settings);