Fixes GTS crash on Nexus 10.

When the video packets are clear, they are being
combined into a full frame between MediaExtractor or
DecryptCallback (where packets are never > 64k) and
MediaCrypto/DecryptVideo (where we are seeing clear
packets > 64k).

The max block size to be passed to DecryptVideo is
specified as 64K, handling of packets larger than 64K
is undefined and OEM implementation-dependent. In the
Nexus 10 case, it generates a SEG. fault.

Solution:
Add mClearSizes vector to keep track of each clear
packet size for android_media_MediaExtractor_getSampleCryptoInfo()
to process.

In android_media_MediaExtractor_getSampleCryptoInfo(), if it
does not see kKeyEncryptedSizes meta data, it will not
process the clear vector that contains the actual packet
sizes. Add a kKeyEncryptedSizes meta data that contains a zero
length size packet to trick the JNI code to process the
clear packets.

related-to-bug: 9261447

Change-Id: Ib0b655a95e099856babaf649f4a95fc7f9c17d41

proprietary/wvm/include/WVMMediaSource.h

@@ -42,6 +42,7 @@ public:
     virtual status_t read(MediaBuffer **buffer, const ReadOptions *options = NULL);
 
     void addEncryptedSize(size_t size) { mEncryptedSizes.push_back(size); }
+    void addClearSize(size_t size) { mClearSizes.push_back(size); }
 
     static int sLastError;
 
@@ -103,6 +104,7 @@ private:
     sp<ClientContext> mClientContext;
 
     Vector<size_t> mEncryptedSizes;
+    Vector<size_t> mClearSizes;
     char mCryptoPluginKey[kCryptoBlockSize];
 
     void allocBufferGroup();