Add automated tests for PDFs.

chrome/browser/plugin_updater.cc

Index: chrome/browser/plugin_updater.cc
===================================================================
--- chrome/browser/plugin_updater.cc	(revision 64006)
+++ chrome/browser/plugin_updater.cc	(working copy)
@@ -132,6 +132,8 @@
   bool found_internal_pdf = false;
   bool force_enable_internal_pdf = false;
   string16 pdf_group_name = ASCIIToUTF16(PepperPluginRegistry::kPDFPluginName);
+  bool force_internal_pdf_for_this_run = CommandLine::ForCurrentProcess()->
+      HasSwitch(switches::kForceInternalPDFPlugin);
   FilePath pdf_path;
   PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf_path);
   FilePath::StringType pdf_path_str = pdf_path.value();
@@ -177,9 +179,13 @@
 
         if (FilePath::CompareIgnoreCase(path, pdf_path_str) == 0) {
           found_internal_pdf = true;
-          if (!enabled && force_enable_internal_pdf) {
-            enabled = true;
-            plugin->SetBoolean("enabled", true);
+          if (!enabled) {
+            if (force_enable_internal_pdf) {
+              enabled = true;
+              plugin->SetBoolean("enabled", true);
+            } else if (force_internal_pdf_for_this_run) {
+              enabled = true;
+            }
           }
         }
         if (!enabled)
@@ -202,7 +208,8 @@
       profile->GetPrefs()->GetList(prefs::kPluginsPluginsBlacklist);
   DisablePluginsFromPolicy(plugin_blacklist);
 
-  if (!enable_internal_pdf_ && !found_internal_pdf) {
+  if ((!enable_internal_pdf_ && !found_internal_pdf) &&
+      !force_internal_pdf_for_this_run) {
     // The internal PDF plugin is disabled by default, and the user hasn't
     // overridden the default.
     NPAPI::PluginList::Singleton()->DisablePlugin(pdf_path);