Add method for identifying different InfoBars

chrome/browser/gpu/three_d_api_observer.cc

Index: chrome/browser/gpu/three_d_api_observer.cc
diff --git a/chrome/browser/gpu/three_d_api_observer.cc b/chrome/browser/gpu/three_d_api_observer.cc
index e97e956e5d0c718c2e3ea812a9dc690d6065a1a7..54f3312100235874efc5580bb25ac17aec1141ab 100644
--- a/chrome/browser/gpu/three_d_api_observer.cc
+++ b/chrome/browser/gpu/three_d_api_observer.cc
@@ -38,6 +38,7 @@ class ThreeDAPIInfoBarDelegate : public ConfirmInfoBarDelegate {
   ~ThreeDAPIInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
+  std::string GetIdentifier() const override;
   int GetIconId() const override;
   bool EqualsDelegate(infobars::InfoBarDelegate* delegate) const override;
   ThreeDAPIInfoBarDelegate* AsThreeDAPIInfoBarDelegate() override;
@@ -86,6 +87,10 @@ ThreeDAPIInfoBarDelegate::~ThreeDAPIInfoBarDelegate() {
   }
 }
 
+std::string ThreeDAPIInfoBarDelegate::GetIdentifier() const {
+  return "ThreeDAPIInfoBarDelegate";
+}
+
 int ThreeDAPIInfoBarDelegate::GetIconId() const {
   return IDR_INFOBAR_3D_BLOCKED;
 }