Cherry pick 18.4 changes to udc-widevine-dev

Get the udc-widevine-dev Android branch and oemcrypto-v18 cdm branch in
sync. The commit ID for 18.4 on oemcrypto-v18 is
a2f23a2281e5e06dc2867585bdc516fa132b6396.

Merged from go/wvgerrit/190151

Bug: 290252845
Test: WVTS tests are running and passing
Change-Id: I457332e7ca70a5b5169345e1279b3eb9f18413b6

libwvdrmengine/oemcrypto/odk/test/fuzzing/corpus_generator/odk_fuzz_corpus_generator.gyp

@@ -0,0 +1,33 @@
+# Copyright 2020 Google LLC. All rights reserved. This file and proprietary
+# source code may only be used and distributed under the Widevine License
+# Agreement.
+
+# Reference Link explaining flags for LD_PRELOAD: https://catonmat.net/simple-ld-preload-tutorial-part-two
+{
+  'targets': [
+    {
+      'target_name': 'odk_corpus_generator',
+        'type': 'shared_library',
+        'cflags_cc': [
+          '-g3',
+          '-O0',
+          '-fno-omit-frame-pointer',
+          '-Wall',
+        ],
+        'include_dirs': [
+          '../../../include',
+          '../../../test',
+          '../corpus_generator',
+        ],
+        'ldflags': [
+          '-fPIC',
+        ],
+        'libraries': [
+          '-ldl',
+        ],
+        'sources': [
+          'odk_corpus_generator.c',
+        ],
+    }
+  ]
+}

libwvdrmengine/oemcrypto/odk/test/fuzzing/odk_fuzz.gyp

@@ -0,0 +1,44 @@
+# Copyright 2019 Google LLC. All rights reserved. This file and proprietary
+# source code may only be used and distributed under the Widevine License
+# Agreement.
+
+#TODO(b/151858867): Fix File paths
+{
+  'targets': [
+    {
+      'target_name': 'odk_fuzz',
+        'type': 'executable',
+        'includes': [
+          '../src/odk.gypi',
+          '../kdo/oec_util.gypi',
+        ],
+        'include_dirs': [
+          '../../include',
+          '../include',
+          '../src',
+          '../kdo/include',
+        ],
+        'cflags': [
+          # TODO(b/172518513): Remove this
+          '-Wno-error=cast-qual',
+        ],
+        'cflags_cc': [
+          '-std=c++14',
+          '-g3',
+          '-O0',
+          '-fsanitize=fuzzer,address,undefined',
+          '-fno-omit-frame-pointer',
+        ],
+        'ldflags': [
+          '-fPIC',
+          '-fsanitize=fuzzer,address,undefined',
+        ],
+        'sources': [
+          'odk_fuzz.cpp',
+        ],
+        'dependencies': [
+          '../../../cdm/cdm.gyp:license_protocol'
+        ],
+    }
+  ]
+}