Entitlement rotation support

Updates also include:
- Add APIs to query current Simulcrypt channel & stream status;
- EMM format change (used only to carry fingerprinting and service
blocking info);
- Key fetcher example to use curl key fetcher.

common/security_profile_list.h

@@ -71,25 +71,26 @@ class SecurityProfileList {
   // contain single record. For custom DSP, it may contain multiple records
   // since active dsp and inactive dsp could share the same dsp_name under the
   // same owner.
-  bool GetProfileByNameAndOwner(
+  virtual bool GetProfileByNameAndOwner(
       const std::string& name, const std::string& owner,
       std::vector<SecurityProfile>* security_profiles) const;
 
   // Populates |security_profiles| owned by the content owner.
-  int GetProfilesByOwner(const std::string& owner,
-                         std::vector<SecurityProfile>* security_profiles) const;
+  virtual int GetProfilesByOwner(
+      const std::string& owner,
+      std::vector<SecurityProfile>* security_profiles) const;
 
   // Populates |owner_list| for security profiles. |is_default_dsp| boolean
   // indicates the owner_list for default dsp or custom dsp.
-  int GetProfilesOwnerList(const bool is_default_dsp,
-                           std::vector<std::string>* owner_list) const;
+  virtual int GetProfilesOwnerList(const bool is_default_dsp,
+                                   std::vector<std::string>* owner_list) const;
 
   // Return the device security capabilities.  |drm_info| is populated with
   // data from |client_id| and |device_info|.  |drm_info| must not be null and
   // is owned by the caller.
-  bool GetDrmInfo(const ClientIdentification& client_id,
-                  const ProvisionedDeviceInfo& device_info,
-                  SecurityProfile::DrmInfo* drm_info) const;
+  virtual bool GetDrmInfo(const ClientIdentification& client_id,
+                          const ProvisionedDeviceInfo& device_info,
+                          SecurityProfile::DrmInfo* drm_info) const;
 
   // Return the number of profiles in the list.
   int NumProfiles() const;
@@ -110,6 +111,12 @@ class SecurityProfileList {
       HashAlgorithm hash_algorithm, const std::string& signature,
       int* added_profile_num);
 
+  // Returns an instance of the Security profile list for default security
+  // profiles.  Default security profiles are owned by Widevine.
+  // TODO (b/187073516): This singleton can be moved to the "Environment" class
+  // as a non-static API.
+  static SecurityProfileList* GetInstanceForDefaultSecurityProfiles();
+
  protected:
   void ClearAllProfiles();