Adding app package name to license request.

[ Merge of http://go/wvgerrit/94323 ]

Content providers wish to know the application package name that is
requesting a license from the content server.  The app package name that
is provided to the CDM during initialization is provided to the client
identification message as a key-value pair during license request
generation.  App packages names are keyed under 'application_name'.

This feature was tested manually by scraping the content of the license
request for YouTube TV.

Bug: 148689078
Test: manual
Change-Id: I6b65f2ab9845dbea37aaaab76ecea25c228bde5b

libwvdrmengine/mediadrm/include_hidl/WVDrmPlugin.h

@@ -425,6 +425,8 @@ struct WVDrmPlugin : public IDrmPlugin, IDrmPluginListener,
 
   wvcdm::CdmSessionId mDecryptHashSessionId;
 
+  std::string mAppPackageName;
+
   Status queryProperty(const std::string& property,
         std::string& stringValue) const;
 

libwvdrmengine/mediadrm/src_hidl/WVDrmPlugin.cpp

@@ -33,6 +33,7 @@ static const char* const kEnable = "enable";
 static const char* const kDisable = "disable";
 static const std::string kPsshTag = "pssh";
 static const char* const kSpecialUnprovisionResponse = "unprovision";
+static const std::string kKeyAppPackageName = "application_name";
 
 }   // namespace
 
@@ -192,7 +193,8 @@ WVDrmPlugin::WVDrmPlugin(const sp<WvContentDecryptionModule>& cdm,
   : mCdmIdentifierBuilder(useSpoid, *this, appPackageName),
     mCDM(cdm),
     mCrypto(crypto),
-    mCryptoSessions() {}
+    mCryptoSessions(),
+    mAppPackageName(appPackageName) {}
 
 WVDrmPlugin::~WVDrmPlugin() {
   typedef map<CdmSessionId, CryptoSession>::iterator mapIterator;
@@ -515,6 +517,10 @@ Return<void> WVDrmPlugin::getKeyRequest_1_2(
     cdmParameters[cdmKey] = cdmValue;
   }
 
+  // Inserting application name into parameters.  This will overwrite user
+  // parameters of the same key.
+  cdmParameters[kKeyAppPackageName] = mAppPackageName;
+
   CdmKeyRequest keyRequest;
   CdmResponseType res = mCDM->GenerateKeyRequest(
       cdmSessionId, cdmKeySetId, cdmInitDataType, processedInitData,