Adds PrintingContext implementation stub for Android.

chrome/browser/android/tab_android_test_stubs.cc

Index: chrome/browser/android/tab_android_test_stubs.cc
diff --git a/chrome/browser/android/tab_android_test_stubs.cc b/chrome/browser/android/tab_android_test_stubs.cc
index 414ca101a3523cc4cf99ed46315a2738853fc297..48f1513c1868d2e01113df9d0e752bd03b59067d 100644
--- a/chrome/browser/android/tab_android_test_stubs.cc
+++ b/chrome/browser/android/tab_android_test_stubs.cc
@@ -5,11 +5,14 @@
 // This file contains stubs for some Chrome for Android specific code that is
 // needed to compile some tests.
 
+#include <string>
+
 #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"
 
 // static
 TabAndroid* TabAndroid::FromWebContents(content::WebContents* web_contents) {
@@ -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;
+}