OEMCrypto v11 Refrence Code and Unit Tests

This CL is a merge from the widevine repo of
http://go/wvgerrit/16553 Prebuilt Level 3 OEMCrypto for Android
http://go/wvgerrit/16238 Require OEMCrypto v11 for Android N Unit Tests
http://go/wvgerrit/16484 Shared License Tests (OEMCrypto v11)
http://go/wvgerrit/16448 Pattern Decrypt Unit Tests and Reference Implementation
http://go/wvgerrit/16489 Enforce UNUSED Variables
http://go/wvgerrit/16479 Pattern Decrypt for Level 3 OEMCrypto
http://go/wvgerrit/16280 Correctly handle bad RSA key
http://go/wvgerrit/16315 Security Patch Level - haystack version
http://go/wvgerrit/16282 Correctly handle null pointer in GetKeyData
http://go/wvgerrit/16294 Initialize data for generation number

It contains the Level 3 implementation, as well.
mips/libwvlevel3.a  Level3 Library Jan 22 2016 14:30:27
arm/libwvlevel3.a  Level3 Library Jan 22 2016 15:03:55
x86/libwvlevel3.a  Level3 Library Jan 22 2016 13:52:29

b/26692954 [DRM] OEMCrypto v11 needed for Nexus devices

Change-Id: Ibb1384959620f63a1be1e82ce2952ec9f48f0d3e

libwvdrmengine/oemcrypto/mock/src/oemcrypto_key_mock.cpp

@@ -11,7 +11,6 @@
 #include "oemcrypto_logging.h"
 #include "wv_cdm_constants.h"
 
-
 namespace wvoec_mock {
 
 bool KeyControlBlock::Validate() {
@@ -102,9 +101,6 @@ KeyControlBlock::KeyControlBlock(
   Validate();
 }
 
-Key::Key(const std::vector<uint8_t>& key_string, const KeyControlBlock& control)
-    : value_(key_string), control_(control) {}
-
 void Key::UpdateDuration(const KeyControlBlock& control) {
   control_.set_duration(control.duration());
 }