Add bench_playback, for quick profiling of SKR playback.

gyp/tools.gyp

 # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       # Build all executable targets defined below.
       'target_name': 'tools',
       'type': 'none',
       'dependencies': [
         'bbh_shootout',
         'bench_pictures',
         'bench_record',
+        'bench_playback',
         'filter',
         'lua_app',
         'lua_pictures',
         'pinspect',
         'render_pdfs',
         'render_pictures',
         'skdiff',
         'skhello',
         'skpdiff',
         'skpinfo',
@@ skipping 272 matching lines @@
         '../src/images',
         '../src/lazy',
       ],
       'dependencies': [
         'flags.gyp:flags',
         'skia_lib.gyp:skia_lib',
         'record.gyp:*',
       ],
     },
     {
+      'target_name': 'bench_playback',
+      'type': 'executable',
+      'sources': [
+        '../tools/bench_playback.cpp',
+        '../tools/LazyDecodeBitmap.cpp',
+      ],
+      'include_dirs': [
+        '../src/core/',
+        '../src/images',
+        '../src/lazy',
+      ],
+      'dependencies': [
+        'flags.gyp:flags',
+        'skia_lib.gyp:skia_lib',
+        'record.gyp:*',
+      ],
+    },
+    {
       'target_name': 'picture_renderer',
       'type': 'static_library',
       'sources': [
         '../tools/LazyDecodeBitmap.cpp',
         '../tools/PictureRenderer.h',
         '../tools/PictureRenderer.cpp',
         '../tools/PictureRenderingFlags.h',
         '../tools/PictureRenderingFlags.cpp',
         '../tools/CopyTilesRenderer.h',
         '../tools/CopyTilesRenderer.cpp',
@@ skipping 233 matching lines @@
             'type': 'executable',
             'sources': [
               '../tools/win_lcid.cpp',
             ],
           },
         ],
       },
     ],
   ],
 }