Add initial GLImage tracing + stubs

ui/gl/gl_image_io_surface.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gl_image_io_surface.h"
 
 #include <map>
 
 #include "base/lazy_instance.h"
 #include "base/mac/foundation_util.h"
@@ skipping 199 matching lines @@
     return false;
   CALayer* layer = found->second;
 
   // Also note that transactions are not disabled. The caller must ensure that
   // all changes to the CALayer tree happen atomically.
   [layer setContents:static_cast<id>(io_surface_.get())];
   [layer setFrame:bounds_rect.ToCGRect()];
   return true;
 }
 
+void GLImageIOSurface::DumpMemory(base::trace_event::ProcessMemoryDump* pmd,
+                                  uint64_t process_tracing_id,
+                                  const std::string& dump_name) {
+  // TODO(ericrk): Implement GLImage DumpMemory. crbug.com/514914
+}
+
 // static
 void GLImageIOSurface::SetLayerForWidget(
     gfx::AcceleratedWidget widget, CALayer* layer) {
   if (layer)
     g_widget_to_layer_map.Pointer()->insert(std::make_pair(widget, layer));
   else
     g_widget_to_layer_map.Pointer()->erase(widget);
 }
 
 }  // namespace gfx