Implement window.print() on Android

printing/printing_context.h

Index: printing/printing_context.h
diff --git a/printing/printing_context.h b/printing/printing_context.h
index 0cc4731a19e98169d44b25ad235810dcd0d34818..47148bd4e43a7a5c56accf21ec97d840e514ab1a 100644
--- a/printing/printing_context.h
+++ b/printing/printing_context.h
@@ -38,11 +38,12 @@ class PRINTING_EXPORT PrintingContext {
     virtual std::string GetAppLocale() = 0;
   };
 
-  // Tri-state result for user behavior-dependent functions.
+  // Result for user behavior-dependent functions.
   enum Result {
     OK,
     CANCEL,
     FAILED,
+    SYSTEM_DIALOG_DONE,
   };
 
   virtual ~PrintingContext();
@@ -55,8 +56,10 @@ class PRINTING_EXPORT PrintingContext {
   // context with the select device settings. The result of the call is returned
   // in the callback. This is necessary for Linux, which only has an
   // asynchronous printing API.
+  // TODO: doc
   virtual void AskUserForSettings(int max_pages,
                                   bool has_selection,
+                                  bool is_scripted,
                                   const PrintSettingsCallback& callback) = 0;
 
   // Selects the user's default printer and format. Updates the context with the