Switch the about:gpu implementation from an about handler to dom_ui....

chrome/chrome.gyp

Index: chrome/chrome.gyp
===================================================================
--- chrome/chrome.gyp	(revision 65555)
+++ chrome/chrome.gyp	(working copy)
@@ -59,6 +59,7 @@
       # used by internal pages.  Putting them in a spearate pak file makes
       # it easier for us to reference them internally.
       'browser/resources/bookmark_manager_resources.grd',
+      'browser/resources/gpu_resources.grd',
       'browser/resources/net_internals_resources.grd',
       'browser/resources/shared_resources.grd'
     ],
@@ -1520,6 +1521,7 @@
                 'pak_inputs': [
                   '<(grit_out_dir)/bookmark_manager_resources.pak',
                   '<(grit_out_dir)/net_internals_resources.pak',
+                  '<(grit_out_dir)/gpu_resources.pak',
                   '<(grit_out_dir)/shared_resources.pak',
                 ],
               },