Fix errors found in Mac gn component builds

gpu/command_buffer_service.gypi

Index: gpu/command_buffer_service.gypi
diff --git a/gpu/command_buffer_service.gypi b/gpu/command_buffer_service.gypi
index 95a0aa2c4292e059ec58c9242f578111f1df78ca..953ddd24c4390e6a9fb7e3ef12895ca584919a79 100644
--- a/gpu/command_buffer_service.gypi
+++ b/gpu/command_buffer_service.gypi
@@ -142,6 +142,15 @@
         '../third_party/khronos',
       ],
     }],
+    ['OS=="mac"', {
+      # Required by gles2_cmd_decoder.cc on Mac.
+      'link_settings': {
+        'libraries': [
+          '$(SDKROOT)/System/Library/Frameworks/IOSurface.framework',
+          '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
+        ],
+      },
+    }],
     ['OS in ("win", "android") or (OS == "linux" and use_x11 == 1)', {
       'sources': [
         'command_buffer/service/async_pixel_transfer_manager_egl.cc',