Move decoder into separate thread, clean up API layering, and redo update protocl

remoting/base/decompressor_zlib.h

Index: remoting/base/decompressor_zlib.h
diff --git a/remoting/base/decompressor_zlib.h b/remoting/base/decompressor_zlib.h
index b76248066a3c7cbc89878346c3819cce104a6539..b5d122b3646dbcc67b5471cef4393dbe15c4715f 100644
--- a/remoting/base/decompressor_zlib.h
+++ b/remoting/base/decompressor_zlib.h
@@ -18,12 +18,15 @@ class DecompressorZlib : public Decompressor {
   DecompressorZlib();
   virtual ~DecompressorZlib();
 
+  virtual void Reset();
+
   // Decompressor implementations.
   virtual bool Process(const uint8* input_data, int input_size,
                        uint8* output_data, int output_size,
                        int* consumed, int* written);
 
  private:
+  void InitStream();
   scoped_ptr<z_stream> stream_;
 };