Update of DRM framework

 - Overload openDecryptSession() with uri parameter
   in order to accept URI of DRM content,
   Following API is added,
       DecryptHandle*openDecryptSession(const char* uri);.
 - Unify texisting three event types of processDrmInfo()
   so that caller of DRM framework does not have to handle many event types.
 - Let DrmManagerService call load/unload plugins API so that
   client of DRM framework does not have to manage plug-in load/unload.
 - Trivial fix in DrmManagerClient.java is also incorporated.

Changes are made by Sony Corporation.

Change-Id: If62b47fa0360718fdc943e6e6143671d7db26adc
diff --git a/drm/common/DrmEngineBase.cpp b/drm/common/DrmEngineBase.cpp
index 17cdf54..10c64ee 100644
--- a/drm/common/DrmEngineBase.cpp
+++ b/drm/common/DrmEngineBase.cpp
@@ -120,6 +120,11 @@
     return onOpenDecryptSession(uniqueId, decryptHandle, fd, offset, length);
 }
 
+status_t DrmEngineBase::openDecryptSession(
+    int uniqueId, DecryptHandle* decryptHandle, const char* uri) {
+    return onOpenDecryptSession(uniqueId, decryptHandle, uri);
+}
+
 status_t DrmEngineBase::closeDecryptSession(int uniqueId, DecryptHandle* decryptHandle) {
     return onCloseDecryptSession(uniqueId, decryptHandle);
 }