Add woff2 encoder/decoder support for overlapSimpleBitmap.

overlapSimpleBitmap is a new field in the transformed glyf table (https://www.w3.org/TR/WOFF2/#glyf_table_format). It allows the overlap simple flag set on glyphs in the original font to be saved into the woff2 encoding.

include/woff2/encode.h

@@ -26,8 +26,8 @@ struct WOFF2Params {
 
 // Returns an upper bound on the size of the compressed file.
 size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length);
-size_t MaxWOFF2CompressedSize(const uint8_t* data, size_t length,
-                              const std::string& extended_metadata);
+size_t MaxWOFF2CompressedSize(const uint8_t *data, size_t length,
+                              const std::string &extended_metadata);
 
 // Compresses the font into the target buffer. *result_length should be at least
 // the value returned by MaxWOFF2CompressedSize(), upon return, it is set to the

include/woff2/output.h

@@ -51,7 +51,7 @@ class WOFF2StringOut : public WOFF2Out {
   // Create a writer that writes its data to buf.
   // buf->size() will grow to at most max_size
   // buf may be sized (e.g. using EstimateWOFF2FinalSize) or empty.
-  explicit WOFF2StringOut(std::string* buf);
+  explicit WOFF2StringOut(std::string *buf);
 
   bool Write(const void *buf, size_t n) override;
   bool Write(const void *buf, size_t offset, size_t n) override;
@@ -59,7 +59,7 @@ class WOFF2StringOut : public WOFF2Out {
   size_t MaxSize() { return max_size_; }
   void SetMaxSize(size_t max_size);
  private:
-  std::string* buf_;
+  std::string *buf_;
   size_t max_size_;
   size_t offset_;
 };