Adds PrintingContext implementation stub for Android.

chrome/android/testshell/testshell_stubs.cc

Index: chrome/android/testshell/testshell_stubs.cc
diff --git a/chrome/android/testshell/testshell_stubs.cc b/chrome/android/testshell/testshell_stubs.cc
index 01c665a895a46db2bb18b950ebba98d8d7ac2c8e..eeb71d7ce615cd108695f2c60ef3e4ee7ee39882 100644
--- a/chrome/android/testshell/testshell_stubs.cc
+++ b/chrome/android/testshell/testshell_stubs.cc
@@ -8,6 +8,8 @@
 #include "chrome/browser/translate/translate_infobar_delegate.h"
 #include "chrome/browser/ui/auto_login_infobar_delegate.h"
 #include "chrome/browser/ui/auto_login_infobar_delegate_android.h"
+#include "printing/printing_context.h"
+#include "printing/printing_context_android.h"
 
 // This file contains temporary stubs to allow the libtestshell target to
 // compile. They will be removed once real implementations are
@@ -57,3 +59,14 @@ InfoBar* ConfirmInfoBarDelegate::CreateInfoBar(InfoBarService* owner) {
 InfoBar* TranslateInfoBarDelegate::CreateInfoBar(InfoBarService* owner) {
   return NULL;
 }
+
+// static
+printing::PrintingContext* printing::PrintingContext::Create(
+    const std::string& app_locale) {
+  return NULL;
+}
+
+// static
+void printing::PrintingContextAndroid::PdfWritingDone(int fd, bool success) {
+}
+