Increase Widevine stream buffer size from 10MB to 16MB for Q

Provide better support for 1080p video streaming.

Change-Id: I3d17f7bdc631ee82b9062445dca8ebd42eaf8d8a
related-to-bug: 6818319

proprietary/wvm/include/WVMExtractorImpl.h

@@ -77,7 +77,7 @@ private:
 
     status_t readMetaData();
 
-    const static size_t kStreamCacheSize = 10 * 1024 * 1024;
+    const static size_t kStreamCacheSize = 16 * 1024 * 1024;
 
     WVMExtractorImpl(const WVMExtractorImpl &);
     WVMExtractorImpl &operator=(const WVMExtractorImpl &);