Support lossy and lossless <canvas>.toDataURL for webp

Source/platform/MIMETypeRegistry.cpp

 /*
  * Copyright (c) 2008, 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 69 matching lines @@
 bool MIMETypeRegistry::isSupportedImagePrefixedMIMEType(const String& mimeType)
 {
     return Platform::current()->mimeRegistry()->supportsImagePrefixedMIMEType(mimeType.lower())
         != WebMimeRegistry::IsNotSupported;
 }
 
 bool MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(const String& mimeType)
 {
     if (equalIgnoringCase(mimeType, "image/jpeg") || equalIgnoringCase(mimeType, "image/png"))
         return true;
-    if (equalIgnoringCase(mimeType, "image/webp"))
+    if (equalIgnoringCase(mimeType, "image/webp") || equalIgnoringCase(mimeType, "image/webp.ll"))
         return true;
     return false;
 }
 
 bool MIMETypeRegistry::isSupportedJavaScriptMIMEType(const String& mimeType)
 {
     return Platform::current()->mimeRegistry()->supportsJavaScriptMIMEType(mimeType.lower())
         != WebMimeRegistry::IsNotSupported;
 }
 
@@ skipping 14 matching lines @@
     // Since this set is very limited and is likely to remain so we won't bother with the overhead
     // of using a hash set.
     // Any of the MIME types below may be followed by any number of specific versions of the JVM,
     // which is why we use startsWith()
     return mimeType.startsWith("application/x-java-applet", TextCaseInsensitive)
         || mimeType.startsWith("application/x-java-bean", TextCaseInsensitive)
         || mimeType.startsWith("application/x-java-vm", TextCaseInsensitive);
 }
 
 } // namespace blink