Add a new parameter dest_type to the GL_CHROMIUM_copy_texture extension.

gpu/command_buffer/service/gles2_cmd_decoder_autogen.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h b/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
index 6ea12d8830df2c42d79de506f6884e89181cd3d0..c5245b131d1f4d9e323fe3fb32c7a1870276dab1 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_autogen.h
@@ -3028,12 +3028,20 @@ error::Error GLES2DecoderImpl::HandleCopyTextureCHROMIUM(
   GLenum dest_id = static_cast<GLenum>(c.dest_id);
   GLint level = static_cast<GLint>(c.level);
   GLint internalformat = static_cast<GLint>(c.internalformat);
+  GLint dest_type = static_cast<GLint>(c.dest_type);
   if (!validators_->texture_internal_format.IsValid(internalformat)) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_VALUE, "glCopyTextureCHROMIUM", "internalformat GL_INVALID_VALUE");  // NOLINT
     return error::kNoError;
   }
-  DoCopyTextureCHROMIUM(target, source_id, dest_id, level, internalformat);
+  if (!validators_->pixel_type.IsValid(dest_type)) {
+    LOCAL_SET_GL_ERROR(
+        GL_INVALID_VALUE, "glCopyTextureCHROMIUM",
+        "dest_type GL_INVALID_VALUE");
+    return error::kNoError;
+  }
+  DoCopyTextureCHROMIUM(target, source_id, dest_id, level, internalformat,
+                       dest_type);
   return error::kNoError;
 }