Add SVG as a picture supported mime type

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 55 matching lines @@
         return "application/octet-stream";
     return mimeType;
 }
 
 bool MIMETypeRegistry::isSupportedImageMIMEType(const String& mimeType)
 {
     return blink::Platform::current()->mimeRegistry()->supportsImageMIMEType(mimeType.lower())
         != blink::WebMimeRegistry::IsNotSupported;
 }
 
+bool MIMETypeRegistry::isSupportedImagePrefixedMIMEType(const String& mimeType)
+{
+    return blink::Platform::current()->mimeRegistry()->supportsImagePrefixedMIMEType(mimeType.lower())
+        != blink::WebMimeRegistry::IsNotSupported;
+}
+
 bool MIMETypeRegistry::isSupportedImageResourceMIMEType(const String& mimeType)
 {
     return isSupportedImageMIMEType(mimeType);
 }
 
 bool MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(const String& mimeType)
 {
     if (equalIgnoringCase(mimeType, "image/jpeg") || equalIgnoringCase(mimeType, "image/png"))
         return true;
     if (equalIgnoringCase(mimeType, "image/webp"))
@@ skipping 30 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", false)
         || mimeType.startsWith("application/x-java-bean", false)
         || mimeType.startsWith("application/x-java-vm", false);
 }
 
 } // namespace blink