Add bench_playback, for quick profiling of SKR playback.

It is not completely fair to compare --skr and --noskr numbers.  SKR looks
unfairly good because some optimizations are baked into our SKPs at record
time.  But, at least, by using a kWriteOnly_Mode SkRecorder, we prevent
SkPicturePlayback from compounding that unfairness.  SkRecordDraw must handle
its own playback-time optimizations (quickrejects) on its own.

This code should look suspiciously similar to bench_record.

BUG=skia:2378
R=fmalita@chromium.org, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/233833002

git-svn-id: http://skia.googlecode.com/svn/trunk@14151 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/tools.gyp b/gyp/tools.gyp
index 079fd4d..8bcebf5 100644
--- a/gyp/tools.gyp
+++ b/gyp/tools.gyp
@@ -16,6 +16,7 @@
         'bbh_shootout',
         'bench_pictures',
         'bench_record',
+        'bench_playback',
         'filter',
         'lua_app',
         'lua_pictures',
@@ -308,6 +309,24 @@
       ],
     },
     {
+      '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': [