Add basic stacktrace handler using libunwind.

gyp/dm.gyp

 # GYP for "dm" (Diamond Master, a.k.a Dungeon master, a.k.a GM 2).
 # vim: set expandtab tabstop=4 shiftwidth=4
 {
     'includes': [ 'apptype_console.gypi' ],
 
     'targets': [{
         'target_name': 'dm',
         'type': 'executable',
         'include_dirs': [
             '../bench',
@@ skipping 37 matching lines @@
             '../dm/DMWriteTask.cpp',
             '../gm/gm.cpp',
             '../gm/gm_expectations.cpp',
 
             '../src/pipe/utils/SamplePipeControllers.cpp',
             '../src/utils/debugger/SkDebugCanvas.cpp',
             '../src/utils/debugger/SkDrawCommand.cpp',
             '../src/utils/debugger/SkObjectParser.cpp',
         ],
         'dependencies': [
+            'crash_handler.gyp:CrashHandler',
+            'etc1.gyp:libetc1',
+            'flags.gyp:flags',
+            'gputest.gyp:skgputest',
+            'jsoncpp.gyp:jsoncpp',
             'skia_lib.gyp:skia_lib',
-            'flags.gyp:flags',
-            'jsoncpp.gyp:jsoncpp',
-            'gputest.gyp:skgputest',
-            'etc1.gyp:libetc1',
         ],
         'conditions': [
           ['skia_android_framework', {
               'libraries': [ '-lskia' ],
           }],
           ['skia_poppler_enabled', {
               'sources':      [ '../src/utils/SkPDFRasterizer.cpp' ],
               'defines':      [ 'SK_BUILD_POPPLER' ],
               'dependencies': [ 'poppler.gyp:*' ],
           }],
         ],
     }]
 }