Update brotli 11 May 2016 (4cc756) -> 20 May 2016 (4836af)

third_party/brotli/enc/encode.cc

Index: third_party/brotli/enc/encode.cc
diff --git a/third_party/brotli/enc/encode.cc b/third_party/brotli/enc/encode.cc
index 3e1c79ad56cd7c67ba417ede84b728820ebbbcfd..8b019a6f96209606cc553dfc0735883ec8506de2 100644
--- a/third_party/brotli/enc/encode.cc
+++ b/third_party/brotli/enc/encode.cc
@@ -442,7 +442,8 @@ BrotliCompressor::BrotliCompressor(BrotliParams params)
       large_table_(NULL),
       cmd_code_numbits_(0),
       command_buf_(NULL),
-      literal_buf_(NULL) {
+      literal_buf_(NULL),
+      is_last_block_emitted_(0) {
   // Sanitize params.
   params_.quality = std::max(0, params_.quality);
   if (params_.lgwin < kMinWindowBits) {
@@ -583,6 +584,10 @@ bool BrotliCompressor::WriteBrotliData(const bool is_last,
   const uint8_t* data = ringbuffer_->start();
   const uint32_t mask = ringbuffer_->mask();
 
+  /* Adding more blocks after "last" block is forbidden. */
+  if (is_last_block_emitted_) return false;
+  if (is_last) is_last_block_emitted_ = 1;
+
   if (delta > input_block_size()) {
     return false;
   }