Support "learn more" link for EME in PermissionRequestManager code-path on Android

chrome/browser/permissions/permission_prompt_android.h

Index: chrome/browser/permissions/permission_prompt_android.h
diff --git a/chrome/browser/permissions/permission_prompt_android.h b/chrome/browser/permissions/permission_prompt_android.h
index 557572623faf604070af5fcf83c65cdb33c441c8..f92fb8964ec9438c9683371822758cd80b2fce0a 100644
--- a/chrome/browser/permissions/permission_prompt_android.h
+++ b/chrome/browser/permissions/permission_prompt_android.h
@@ -10,6 +10,7 @@
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/permission_bubble/permission_prompt.h"
 #include "components/content_settings/core/common/content_settings_types.h"
+#include "url/gurl.h"
 
 namespace content {
 class WebContents;
@@ -42,6 +43,9 @@ class PermissionPromptAndroid : public PermissionPrompt {
   base::string16 GetMessageText(size_t position) const;
   base::string16 GetMessageTextFragment(size_t position) const;
 
+  base::string16 GetLinkText() const;
+  GURL GetLinkURL() const;
+
  private:
   // PermissionPromptAndroid is owned by PermissionRequestManager, so it should
   // be safe to hold a raw WebContents pointer here because this class is