Allow component installers to specify a map of installer attributes.

chrome/browser/component_updater/widevine_cdm_component_installer.cc

Index: chrome/browser/component_updater/widevine_cdm_component_installer.cc
diff --git a/chrome/browser/component_updater/widevine_cdm_component_installer.cc b/chrome/browser/component_updater/widevine_cdm_component_installer.cc
index e4f11e3d0c52cf175a412a1bfffe7ba4b4af57a9..eb7460923f49915be318c8933f3b2a3e72aaca51 100644
--- a/chrome/browser/component_updater/widevine_cdm_component_installer.cc
+++ b/chrome/browser/component_updater/widevine_cdm_component_installer.cc
@@ -260,7 +260,7 @@ class WidevineCdmComponentInstallerTraits : public ComponentInstallerTraits {
   base::FilePath GetRelativeInstallDir() const override;
   void GetHash(std::vector<uint8_t>* hash) const override;
   std::string GetName() const override;
-  std::string GetAp() const override;
+  update_client::InstallerAttributes GetInstallerAttributes() const override;
 
   // Checks and updates CDM adapter if necessary to make sure the latest CDM
   // adapter is always used.
@@ -335,8 +335,9 @@ std::string WidevineCdmComponentInstallerTraits::GetName() const {
   return kWidevineCdmDisplayName;
 }
 
-std::string WidevineCdmComponentInstallerTraits::GetAp() const {
-  return std::string();
+update_client::InstallerAttributes
+WidevineCdmComponentInstallerTraits::GetInstallerAttributes() const {
+  return update_client::InstallerAttributes();
 }
 
 static bool HasValidAdapter(const base::FilePath& adapter_version_path,