add skpdiff tool to compare bitmaps

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 39 matching lines @@
         '../tools/skdiff_html.h',
         '../tools/skdiff_image.cpp',
         '../tools/skdiff_utils.cpp',
         '../tools/skdiff_utils.h',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
       ],
     },
     {
+      'target_name': 'skpdiff',

[djsollen, 2013/06/12 13:32:04]

we need to figure out a better place to put this. Use the pdfviewer.gyp as your
reference, but replace that target with this one and call it skpdiff.gyp and put
it into your experimental directory.

NOTE: I'm not sure if GYP will let you put it there, so let's talk if that
doesn't work.

[Zach Reizner, 2013/06/12 21:57:47]

Done.

+      'type': 'executable',
+      'sources': [
+        '../experimental/skpdiff/main.cpp',
+        '../experimental/skpdiff/SkImageDiffer.cpp',
+        '../experimental/skpdiff/skpdiff_util.cpp',
+      ],
+      'dependencies': [
+        'skia_lib.gyp:skia_lib',

[djsollen, 2013/06/12 13:32:04]

you will need to update this line to be ../../gyp/skia_lib.gyp:skia_lib

[Zach Reizner, 2013/06/12 21:57:47]

Done.

+      ],
+      'link_settings': {
+        'libraries': [
+          '-lOpenCL',
+        ],
+      },
+    },
+    {
       'target_name': 'skhello',
       'type': 'executable',
       'sources': [
         '../tools/skhello.cpp',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'flags.gyp:flags',
       ],
     },
@@ skipping 242 matching lines @@
       },
     ],
   ],
 }
 
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