Have compositor_model_bench target near its source files.

BUILD.gn

 # Copyright (c) 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 357 matching lines @@
       deps += [
         "//ui/aura:aura_unittests",
         "//ui/aura:bench",
         "//ui/aura:demo",
       ]
     }
 
     if (use_x11) {
       deps += [ "//media:player_x11" ]
       if (target_cpu != "arm") {
-        deps += [ "//gpu:compositor_model_bench" ]
+        deps += [ "//gpu/tools/compositor_model_bench" ]
       }
     }
   }
 
   if (is_mac) {
     deps += [
       "//breakpad:crash_inspector",
       "//breakpad:dump_syms",
       "//breakpad:symupload",
       "//third_party/apple_sample_code",
@@ skipping 266 matching lines @@
       "//ui/touch_selection:ui_touch_selection_unittests",  # PASSES 2/25/2015
       "//ui/views:views_unittests",  # PASSES (*) 2/25/2015
       "//ui/wm:wm_unittests",  # PASSES 2/25/2015
       "//url:url_unittests",  # PASSES 2/25/2015
 
       # Note:
       # (*) Fails but failures match GYP build at time of testing.
     ]
   }
 }