gpu: Add trace event to GLES2DecoderImpl::DoCopyTextureCHROMIUM.

BUG=269808
TBR=piman

Review URL: https://codereview.chromium.org/225993004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263580 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 73852af3..80ca209 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -9844,6 +9844,8 @@
 void GLES2DecoderImpl::DoCopyTextureCHROMIUM(
     GLenum target, GLuint source_id, GLuint dest_id, GLint level,
     GLenum internal_format, GLenum dest_type) {
+  TRACE_EVENT0("gpu", "GLES2DecoderImpl::DoCopyTextureCHROMIUM");
+
   TextureRef* dest_texture_ref = GetTexture(dest_id);
   TextureRef* source_texture_ref = GetTexture(source_id);