Create new target to hold gpu test code, enable direct testing of GrEffects in GM.

gyp/gputest.gyp

Index: gyp/gputest.gyp
diff --git a/gyp/gputest.gyp b/gyp/gputest.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..23d1da3947f2b65864da8507ce820e8202889813
--- /dev/null
+++ b/gyp/gputest.gyp
@@ -0,0 +1,38 @@
+{
+  'targets': [
+    {
+      'target_name': 'skgputest',
+      'product_name': 'skia_skgputest',
+      'type': 'static_library',
+      'standalone_static_library': 1,
+      'dependencies': [
+        'core.gyp:core',
+        'gpu.gyp:skgpu',
+      ],
+      'include_dirs': [
+        '../include/gpu',
+        '../include/utils',
+        '../src/core',
+        '../src/gpu',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '../src/gpu',
+        ],
+      },
+      'sources': [
+        '<(skia_src_path)/gpu/GrTest.cpp',
+        '<(skia_src_path)/gpu/GrTest.h',
+      ],
+      'defines': [
+        'GR_IMPLEMENTATION=1',
+      ],
+    },
+  ],
+}
+
+# Local Variables:
+# tab-width:2
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=2 shiftwidth=2: