Roll latest libvpx to fix hang when doing adaptive playback.

VP9 decoder will hang when switching from frames with 2 tiles to
4 tiles on a 4 core device.

libvpx hash:4fffefe189a9123d4b04482c26a1be5eb632b397

(cherry picked from commit 6ac915abcdb404a00d927fe6308a47fcf09d9519)

Bug: 13931133
Change-Id: I24a51fd572ca7e872bc440491e2c645a20e9a736

1 files changed, 22 insertions, 7 deletions

diff --git a/libvpx/third_party/libwebm/mkvreader.cpp b/libvpx/third_party/libwebm/mkvreader.cpp
index cb3567f..b4b2459 100644
--- a/libvpx/third_party/libwebm/mkvreader.cpp
+++ b/libvpx/third_party/libwebm/mkvreader.cpp
@@ -14,13 +14,20 @@ namespace mkvparser
 {
 
 MkvReader::MkvReader() :
-    m_file(NULL)
-{
+    m_file(NULL),
+    reader_owns_file_(true) {
 }
 
-MkvReader::~MkvReader()
-{
+MkvReader::MkvReader(FILE* fp) :
+    m_file(fp),
+    reader_owns_file_(false) {
+  GetFileSize();
+}
+
+MkvReader::~MkvReader() {
+  if (reader_owns_file_)
     Close();
+  m_file = NULL;
 }
 
 int MkvReader::Open(const char* fileName)
@@ -42,12 +49,17 @@ int MkvReader::Open(const char* fileName)
     if (m_file == NULL)
         return -1;
 #endif
+    return !GetFileSize();
+}
 
+bool MkvReader::GetFileSize() {
+    if (m_file == NULL)
+        return false;
 #ifdef _MSC_VER
     int status = _fseeki64(m_file, 0L, SEEK_END);
 
     if (status)
-        return -1;  //error
+        return false;  //error
 
     m_length = _ftelli64(m_file);
 #else
@@ -56,16 +68,19 @@ int MkvReader::Open(const char* fileName)
 #endif
     assert(m_length >= 0);
 
+    if (m_length < 0)
+        return false;
+
 #ifdef _MSC_VER
     status = _fseeki64(m_file, 0L, SEEK_SET);
 
     if (status)
-        return -1;  //error
+        return false;  //error
 #else
     fseek(m_file, 0L, SEEK_SET);
 #endif
 
-    return 0;
+    return true;
 }
 
 void MkvReader::Close()