Move threadpool code from include/utils to tools/threadpool.

gyp/tools.gyp

 # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
@@ skipping 26 matching lines @@
       'conditions': [
         ['skia_shared_lib',
           {
             'dependencies': [
               'sklua', # This can only be built if skia is built as a shared library
             ],
           },
         ],
       ],
     },
+    {
+      'target_name': 'threadpool',
+      'type': 'static_library',
+      'include_dirs': [ '../tools/threadpool' ],
+      'dependencies': [ 'skia_lib.gyp:skia_lib' ],
+      'sources': [
+        '../tools/threadpool/CondVar.cpp',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [ '../tools/threadpool' ],
+      },
+    },
+
     {  # This would go in gm.gyp, but it's also used by skimage below.
       'target_name': 'gm_expectations',
       'type': 'static_library',
       'include_dirs' : [ '../src/utils/' ],
       'sources': [
         '../gm/gm_expectations.cpp',
       ],
       'dependencies': [
         'jsoncpp.gyp:jsoncpp',
         'sk_tool_utils',
@@ skipping 106 matching lines @@
         '../tools/skpdiff/SkImageDiffer.cpp',
         '../tools/skpdiff/SkPMetric.cpp',
         '../tools/skpdiff/skpdiff_util.cpp',
       ],
       'include_dirs': [
         '../src/core/', # needed for SkTLList.h
       ],
       'dependencies': [
         'flags.gyp:flags',
         'skia_lib.gyp:skia_lib',
+        'tools.gyp:threadpool',
       ],
       'cflags': [
         '-O3',
       ],
       'conditions': [
         [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]', {
           'link_settings': {
             'libraries': [
               '-lrt',
             ],
@@ skipping 530 matching lines @@
             'type': 'executable',
             'sources': [
               '../tools/win_lcid.cpp',
             ],
           },
         ],
       },
     ],
   ],
 }