Basic pixel tests for cc

cc/cc_tests.gyp

Index: cc/cc_tests.gyp
diff --git a/cc/cc_tests.gyp b/cc/cc_tests.gyp
index bdc68ff97962ea70076ace0fb12557fba3c625ad..a5e3eee2df29bdcd4e713c99e58fce8a329d69aa 100644
--- a/cc/cc_tests.gyp
+++ b/cc/cc_tests.gyp
@@ -16,6 +16,7 @@
       'float_quad_unittest.cc',
       'frame_rate_controller_unittest.cc',
       'gl_renderer_unittest.cc',
+      'gl_renderer_pixeltest.cc',
       'hash_pair_unittest.cc',
       'heads_up_display_unittest.cc',
       'keyframed_animation_curve_unittest.cc',
@@ -85,6 +86,8 @@
       'test/mock_quad_culler.cc',
       'test/mock_quad_culler.h',
       'test/occlusion_tracker_test_common.h',
+      'test/pixel_test_graphics_context.cc',
+      'test/pixel_test_graphics_context.h',
       'test/render_pass_test_common.cc',
       'test/render_pass_test_common.h',
       'test/scheduler_test_common.cc',
@@ -104,8 +107,10 @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         '../ui/ui.gyp:ui',
+        '../webkit/support/webkit_support.gyp:webkit_gpu',
         'cc.gyp:cc',
         'cc_test_support',
+        'cc_test_utils',
       ],
       'sources': [
         'test/run_all_unittests.cc',
@@ -164,16 +169,32 @@
         '../third_party/WebKit/Source/Platform/chromium',
       ],
       'dependencies': [
-        '../ui/gl/gl.gyp:gl',
-        '../testing/gtest.gyp:gtest',
-        '../testing/gmock.gyp:gmock',
         '../skia/skia.gyp:skia',
+        '../testing/gmock.gyp:gmock',
+        '../testing/gtest.gyp:gtest',
         '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
+        '../third_party/mesa/mesa.gyp:osmesa',
+        '../ui/gl/gl.gyp:gl',
       ],
       'sources': [
         '<@(cc_tests_support_files)',
       ],
     },
+    {
+      'target_name': 'cc_test_utils',
+      'type': 'static_library',
+      'include_dirs': [
+        '..'
+      ],
+      'sources': [
+        'test/pixel_test_utils.cc',
+        'test/pixel_test_utils.h',
+      ],
+      'dependencies': [
+        '../skia/skia.gyp:skia',
+        '../ui/ui.gyp:ui',  # for png_codec
+      ],
+    },
   ],
   'conditions': [
     # Special target to wrap a gtest_target_type==shared_library