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..2f3d44b6c57101fbef3455e36df6063326baccfe 100644
--- a/printing/printing_context.h
+++ b/printing/printing_context.h
@@ -36,6 +36,9 @@ class PRINTING_EXPORT PrintingContext {
 
     // Returns application locale.
     virtual std::string GetAppLocale() = 0;
+
+    // TODO Doc
+    virtual void SetPendingPrint()  = 0;
   };
 
   // Tri-state result for user behavior-dependent functions.
@@ -43,6 +46,7 @@ class PRINTING_EXPORT PrintingContext {
     OK,
     CANCEL,
     FAILED,
+    SYSTEM_DIALOG_DONE,
   };
 
   virtual ~PrintingContext();
@@ -51,6 +55,9 @@ class PRINTING_EXPORT PrintingContext {
   // print settings are available.
   typedef base::Callback<void(Result)> PrintSettingsCallback;
 
+  // TODO DGN doc
+  virtual void RequestSystemDialog(const PrintSettingsCallback& cb) = 0;
+
   // Asks the user what printer and format should be used to print. Updates the
   // 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