Add initial implementation of SourceBufferStream

media/base/data_buffer.cc

Index: media/base/data_buffer.cc
diff --git a/media/base/data_buffer.cc b/media/base/data_buffer.cc
index b082a18a14bc6ad4f85aba1364c03bb8cbfc3a0c..39f2798edfbace78a7a6e9dcc2f2df1ced8032c5 100644
--- a/media/base/data_buffer.cc
+++ b/media/base/data_buffer.cc
@@ -30,6 +30,18 @@ DataBuffer::DataBuffer(int buffer_size)
     data_.reset(NULL);
 }
 
+DataBuffer::DataBuffer(int buffer_size, bool is_keyframe)
+    : Buffer(base::TimeDelta(), base::TimeDelta(), is_keyframe),
+      data_(new uint8[buffer_size]),
+      buffer_size_(buffer_size),
+      data_size_(0) {
+  CHECK(data_.get()) << "DataBuffer ctor failed to allocate memory";
+
+  // Prevent arbitrary pointers.
+  if (buffer_size == 0)
+    data_.reset(NULL);
+}
+
 DataBuffer::~DataBuffer() {}
 
 scoped_refptr<DataBuffer> DataBuffer::CopyFrom(const uint8* data,