Block printing through JS when printing is disabled by policy or pref

chrome/browser/printing/print_view_manager.h

Index: chrome/browser/printing/print_view_manager.h
diff --git a/chrome/browser/printing/print_view_manager.h b/chrome/browser/printing/print_view_manager.h
index 196dae0ddbf23c7c5f763aa7f17c95243a7ea9eb..4db11387efa5e20f8cf7d18bdf8f99ba3c2dd2d8 100644
--- a/chrome/browser/printing/print_view_manager.h
+++ b/chrome/browser/printing/print_view_manager.h
@@ -7,6 +7,7 @@
 
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
+#include "chrome/browser/prefs/pref_member.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
@@ -17,6 +18,7 @@ struct PrintHostMsg_DidPrintPage_Params;
 
 namespace content {
 class RenderProcessHost;
+class RenderViewHost;
 }
 
 namespace printing {
@@ -69,8 +71,8 @@ class PrintViewManager : public content::NotificationObserver,
   // renderer in the case of scripted print preview.
   void PrintPreviewDone();
 
-  // Whether to block scripted printing or not.
-  void SetScriptedPrintingBlocked(bool blocked);
+  // Whether to block scripted printing for our tab or not.
+  void UpdateScriptedPrintingBlocked();
 
   // Sets |observer| as the current PrintViewManagerObserver. Pass in NULL to
   // remove the current observer. |observer| may always be NULL, but |observer_|
@@ -86,6 +88,10 @@ class PrintViewManager : public content::NotificationObserver,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // content::WebContentsObserver implementation.
+  virtual void DidStartLoading(
+      content::RenderViewHost* render_view_host) OVERRIDE;
+
+  // content::WebContentsObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Terminates or cancels the print job if one was pending.
@@ -203,6 +209,12 @@ class PrintViewManager : public content::NotificationObserver,
   // Keeps track of the pending callback during scripted print preview.
   content::RenderProcessHost* scripted_print_preview_rph_;
 
+  // Whether printing is enabled.
+  BooleanPrefMember printing_enabled_;
+
+  // Whether our tab content is in blocked state.
+  bool tab_content_blocked_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintViewManager);
 };