media: Enable ProtectedMediaIdentifierPermissionContext on ChromeOS.

chrome/browser/media/protected_media_identifier_infobar_delegate.cc

Index: chrome/browser/media/protected_media_identifier_infobar_delegate.cc
diff --git a/chrome/browser/media/protected_media_identifier_infobar_delegate.cc b/chrome/browser/media/protected_media_identifier_infobar_delegate.cc
index 71e0733e9ffb56393eec35003a1b5d786b637993..673fd1790e4faece1db64f8c9e148ffc5afa82f3 100644
--- a/chrome/browser/media/protected_media_identifier_infobar_delegate.cc
+++ b/chrome/browser/media/protected_media_identifier_infobar_delegate.cc
@@ -9,6 +9,7 @@
 #include "chrome/grit/generated_resources.h"
 #include "components/infobars/core/infobar.h"
 #include "content/public/browser/navigation_entry.h"
+#include "grit/components_strings.h"
 #include "grit/theme_resources.h"
 #include "net/base/net_util.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -17,6 +18,10 @@
 #include "chrome/browser/android/chromium_application.h"
 #endif
 
+#if defined(OS_CHROMEOS)
+#include "chrome/common/url_constants.h"
+#endif
+
 // static
 infobars::InfoBar* ProtectedMediaIdentifierInfoBarDelegate::Create(
     InfoBarService* infobar_service,
@@ -113,8 +118,7 @@ base::string16 ProtectedMediaIdentifierInfoBarDelegate::GetLinkText() const {
   return l10n_util::GetStringUTF16(
       IDS_PROTECTED_MEDIA_IDENTIFIER_SETTINGS_LINK);
 #else
-  NOTIMPLEMENTED();
-  return base::string16();
+  return l10n_util::GetStringUTF16(IDS_LEARN_MORE);
 #endif
 }
 
@@ -122,6 +126,13 @@ bool ProtectedMediaIdentifierInfoBarDelegate::LinkClicked(
     WindowOpenDisposition disposition) {
 #if defined(OS_ANDROID)
   chrome::android::ChromiumApplication::OpenProtectedContentSettings();
+#elif defined(OS_CHROMEOS)
+  const GURL learn_more_url(chrome::kEnhancedPlaybackNotificationLearnMoreURL);
+  InfoBarService::WebContentsFromInfoBar(infobar())
+      ->OpenURL(content::OpenURLParams(
+          learn_more_url, content::Referrer(),
+          (disposition == CURRENT_TAB) ? NEW_FOREGROUND_TAB : disposition,
+          ui::PAGE_TRANSITION_LINK, false));
 #else
   NOTIMPLEMENTED();
 #endif