Certificate provisioning verification

bug: 8620943

This is a merge of changes made to the Widevine CDM
repository during certificate provisioning verification.

The following changes are included:

Fixes for certificate based licensing
https://widevine-internal-review.googlesource.com/#/c/5162/

Base64 encode and decode now handles non-multiple of 24-bits input
https://widevine-internal-review.googlesource.com/#/c/4981/

Fixed issues with device provisioning response handling
https://widevine-internal-review.googlesource.com/#/c/5153/

Persistent storage to support device certificates
https://widevine-internal-review.googlesource.com/#/c/5161/

Enable loading of certificates
https://widevine-internal-review.googlesource.com/#/c/5172/

Provide license server url
https://widevine-internal-review.googlesource.com/#/c/5173/

Change-Id: I0c032c1ae0055dcc1a7a77ad4b0ea0898030dc7d

libwvdrmengine/cdm/Android.mk

@@ -12,6 +12,7 @@ LOCAL_C_INCLUDES := \
     vendor/widevine/libwvdrmengine/oemcrypto/include
 
 LOCAL_C_INCLUDES += \
+    external/openssl/include \
     external/protobuf/src \
     ../oemcrypto/include
 
@@ -26,11 +27,13 @@ LOCAL_SRC_FILES := \
     $(CORE_SRC_DIR)/cdm_session.cpp \
     $(CORE_SRC_DIR)/crypto_engine.cpp \
     $(CORE_SRC_DIR)/crypto_session.cpp \
+    $(CORE_SRC_DIR)/device_files.cpp \
     $(CORE_SRC_DIR)/license.cpp \
     $(CORE_SRC_DIR)/policy_engine.cpp \
     $(CORE_SRC_DIR)/properties.cpp \
     $(CORE_SRC_DIR)/string_conversions.cpp \
     $(SRC_DIR)/clock.cpp \
+    $(SRC_DIR)/file_store.cpp \
     $(SRC_DIR)/lock.cpp \
     $(SRC_DIR)/log.cpp \
     $(SRC_DIR)/properties.cpp \