Update of DRM framework.

- Change "void" type of return value to "int" for returning status.
  - Add some of overloaded Java APIs which accept database Uri as input.
  - Add asynchronous APIs
  - Add OnEventListener and OnErrorListener for asynchronous APIs
  - Disable debug log
  - Change decrypt() API to accept an optional buffer needed by some of DRM schemes

Changes are incorporated by Sony Corporation.

Change-Id: I414a165e22cc79be6ea7cd28041788aa2b6b8f7c

drm/drmserver/StringTokenizer.cpp

@@ -45,12 +45,10 @@ StringTokenizer::Iterator StringTokenizer::iterator() {
 StringTokenizer::Iterator::Iterator(const StringTokenizer::Iterator& iterator) :
     mStringTokenizer(iterator.mStringTokenizer),
     mIndex(iterator.mIndex) {
-    LOGV("StringTokenizer::Iterator::Iterator");
 }
 
 StringTokenizer::Iterator& StringTokenizer::Iterator::operator=(
             const StringTokenizer::Iterator& iterator) {
-    LOGV("StringTokenizer::Iterator::operator=");
     mStringTokenizer = iterator.mStringTokenizer;
     mIndex = iterator.mIndex;
     return *this;