Specify widevine/media_cas_packager_sdk/presubmit in media_cas_packager_sdk METADATA file.

-------------
Moves ecm_generator to media_cas_packager_sdk/internal.

-------------
Add a simple TCP server listening on a port. My intention is to use this server to support the Simulcrypt APIs (TODO).

Also add a simple TCP client binary for testing the server and also demo how to call the Simulcrypt APIs (TODO).

-------------
If only a single key is in the ECM, it is the EVEN key. To make the code matches this understanding, change a parameter from 'false' to 'true'. But this change has NO impact on the produced ECM, regardless this parameter is 'false' or 'true' (i.e., whether using push_front or push_back), only a single key is in the ECM.

-------------
Add classes that process Simulcrypt ECMG messages
1) Stream_set-up
2) CW_provision

-------------
Renames server and client binaries.

-------------
Make ecmg call ecm_generator to generate ecm. The return of the ecm to Simulcrypt caller will be implemented in the next CL.

For now, using the 'key' (control word) in CW_provision message also as the 'key_id'.

-------------
Move common folder

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=217358698

common/BUILD

@@ -1,16 +1,16 @@
 ################################################################################
-# Copyright 2016 Google LLC.
+# Copyright 2017 Google LLC.
 #
 # This software is licensed under the terms defined in the Widevine Master
 # License Agreement. For a copy of this agreement, please contact
 # widevine-licensing@google.com.
 ################################################################################
-
 #
-# Description:
-#   Build file for code common to multiple Widevine services.
+# Constants, data structures, util classes for Widevine libraries.
 
-package(default_visibility = ["//visibility:public"])
+package(
+    default_visibility = ["//visibility:public"],
+)
 
 filegroup(
     name = "binary_release_files",
@@ -19,6 +19,13 @@ filegroup(
     ],
 )
 
+cc_library(
+    name = "widevine_system_id",
+    srcs = ["widevine_system_id.cc"],
+    hdrs = ["widevine_system_id.h"],
+    deps = ["//base"],
+)
+
 cc_library(
     name = "certificate_type",
     hdrs = ["certificate_type.h"],
@@ -48,10 +55,10 @@ cc_test(
     srcs = ["drm_root_certificate_test.cc"],
     deps = [
         ":drm_root_certificate",
+        ":rsa_key",
+        ":rsa_test_keys",
         "//base",
         "//testing:gunit_main",
-        "//common:rsa_key",
-        "//common:rsa_test_keys",
         "//protos/public:drm_certificate_proto",
         "//protos/public:errors_proto",
         "//protos/public:signed_drm_certificate_proto",
@@ -64,9 +71,12 @@ cc_library(
     hdrs = ["certificate_util.h"],
     deps = [
         ":certificate_type",
+        ":drm_root_certificate",
         ":drm_service_certificate",
         ":verified_media_pipeline",
         ":vmp_checker",
+        "//base",
+        "//util:status",
         "//license_server_sdk/internal:sdk",
     ],
 )
@@ -105,6 +115,7 @@ cc_test(
     deps = [
         ":rsa_test_keys",
         ":rsa_util",
+        "//base",
         "//testing:gunit",
         "//testing:gunit_main",
         "//external:openssl",
@@ -139,6 +150,7 @@ cc_test(
     deps = [
         ":rsa_key",
         ":rsa_test_keys",
+        ":rsa_util",
         "//testing:gunit",
         "//testing:gunit_main",
     ],
@@ -320,6 +332,7 @@ cc_test(
     size = "small",
     srcs = ["signing_key_util_test.cc"],
     deps = [
+        ":crypto_util",
         ":signing_key_util",
         "//testing:gunit",
         "//testing:gunit_main",
@@ -519,9 +532,10 @@ cc_library(
     deps = [
         ":certificate_type",
         ":error_space",
+        ":rsa_key",
         ":x509_cert",
         "//base",
-        "@abseil_repo//absl/strings",
+        "//util:status",
         "//protos/public:errors_proto",
         "//protos/public:verified_media_pipeline_proto",
     ],
@@ -561,4 +575,3 @@ cc_test(
         "//testing:gunit_main",
     ],
 )
-