Adds a pref and a policy to decide if PDFs should always be opened externally.

chrome/browser/plugins/plugin_prefs_unittest.cc

Index: chrome/browser/plugins/plugin_prefs_unittest.cc
diff --git a/chrome/browser/plugins/plugin_prefs_unittest.cc b/chrome/browser/plugins/plugin_prefs_unittest.cc
index 411447e4ecbf681241d95ed3aef1694bce51a03f..ce58d71b1503e6f360823afc36cf363de5b9d431 100644
--- a/chrome/browser/plugins/plugin_prefs_unittest.cc
+++ b/chrome/browser/plugins/plugin_prefs_unittest.cc
@@ -69,6 +69,10 @@ class PluginPrefsTest : public ::testing::Test {
         disabled, disabled_exceptions, enabled);
   }
 
+  void SetAlwaysOpenPdfExternally(bool value) {
+    plugin_prefs_->SetAlwaysOpenPdfExternally(value);
+  }
+
  protected:
   void EnablePluginSynchronously(bool enabled,
                                  const base::FilePath& path,
@@ -285,3 +289,15 @@ TEST_F(PluginPrefsTest, UnifiedPepperFlashState) {
 }
 
 #endif
+
+TEST_F(PluginPrefsTest, AlwaysOpenPdfExternally) {
+  EXPECT_EQ(PluginPrefs::NO_POLICY,
+            plugin_prefs_->PolicyStatusForPlugin(
+                base::ASCIIToUTF16(ChromeContentClient::kPDFPluginName)));
+
+  SetAlwaysOpenPdfExternally(true);
+
+  EXPECT_EQ(PluginPrefs::POLICY_DISABLED,
+            plugin_prefs_->PolicyStatusForPlugin(
+                base::ASCIIToUTF16(ChromeContentClient::kPDFPluginName)));
+}