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..7eaa7bcc87588f0e953e99740ba088877f478899 100644
--- a/chrome/android/testshell/testshell_stubs.cc
+++ b/chrome/android/testshell/testshell_stubs.cc
@@ -2,12 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <string>
+
 #include "base/strings/string16.h"
 #include "chrome/browser/android/tab_android.h"
 #include "chrome/browser/infobars/confirm_infobar_delegate.h"
 #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"
 
 // This file contains temporary stubs to allow the libtestshell target to
 // compile. They will be removed once real implementations are
@@ -57,3 +60,9 @@ 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;
+}