gpu: Add CHROMIUM_copy_image extension.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
index eb451a2b66381de28f25f77cbf8908884efa7356..0d77748ab0e640adbe0a76686091ea3f89d605f4 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
@@ -2674,6 +2674,21 @@ error::Error GLES2DecoderPassthroughImpl::DoReleaseTexImage2DCHROMIUM(
   return error::kNoError;
 }
 
+error::Error GLES2DecoderPassthroughImpl::DoCopyImageSubDataCHROMIUM(
+    GLint source_image_id,
+    GLint dest_texture_id,
+    GLint xoffset,
+    GLint yoffset,
+    GLint x,
+    GLint y,
+    GLsizei width,
+    GLsizei height,
+    GLint in_fence_id,
+    GLint out_fence_id) {
+  NOTIMPLEMENTED();
+  return error::kNoError;
+}
+
 error::Error GLES2DecoderPassthroughImpl::DoTraceBeginCHROMIUM(
     const char* category_name,
     const char* trace_name) {