Adding GetTableAction method to Blink to handle color table tags

Source/platform/fonts/opentype/OpenTypeSanitizer.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef OpenTypeSanitizer_h
 #define OpenTypeSanitizer_h
 
+#include "opentype-sanitiser.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class SharedBuffer;
 
 class OpenTypeSanitizer {
 public:
     explicit OpenTypeSanitizer(SharedBuffer* buffer)
         : m_buffer(buffer)
     {
     }
 
     PassRefPtr<SharedBuffer> sanitize();
 
     static bool supportsFormat(const String&);
 
 private:
     SharedBuffer* const m_buffer;
 };
 
+class BlinkOTSContext: public ots::OTSContext {
+public:
+        // TODO: Implement "Message" to support user friendly messages
+        virtual ots::TableAction GetTableAction(uint32_t tag)
+        {
+#define TABLE_TAG(c1, c2, c3, c4) ((uint32_t)((((uint8_t)(c1)) << 24) | (((uint8_t)(c2)) << 16) | (((uint8_t)(c3)) << 8) | ((uint8_t)(c4))))
+
+            const uint32_t cbdtTag = TABLE_TAG('C', 'B', 'D', 'T');
+            const uint32_t cblcTag = TABLE_TAG('C', 'B', 'L', 'C');
+            const uint32_t colrTag = TABLE_TAG('C', 'O', 'L', 'R');
+            const uint32_t cpalTag = TABLE_TAG('C', 'P', 'A', 'L');
+
+            switch (tag) {
+            // Google Color Emoji Tables
+            case cbdtTag:
+            case cblcTag:
+            // Windows Color Emoji Tables
+            case colrTag:
+            case cpalTag:
+                return ots::TABLE_ACTION_PASSTHRU;
+            default:
+                return ots::TABLE_ACTION_DEFAULT;
+            }
+#undef TABLE_TAG
+        }
+};
+
 } // namespace blink
 
 #endif // OpenTypeSanitizer_h