Add JPEG decoder unittest to GN

BUG=506059
TEST=build the unittest and run on Intel/ARM platform

Review-Url: https://codereview.chromium.org/2107133002
Cr-Commit-Position: refs/heads/master@{#407759}

media/gpu/BUILD.gn

@@ -471,3 +471,37 @@ if (is_chromeos || is_mac || is_win) {
     }
   }
 }
+
+if (is_chromeos) {
+  test("jpeg_decode_accelerator_unittest") {
+    deps = [
+      "//base",
+      "//media",
+      "//media/base:test_support",
+      "//media/gpu",
+      "//testing/gtest",
+      "//third_party/libyuv",
+      "//ui/base",
+      "//ui/gfx",
+      "//ui/gfx:test_support",
+      "//ui/gfx/geometry",
+      "//ui/gl",
+      "//ui/gl:test_support",
+    ]
+    configs += [
+      "//third_party/libva:libva_config",
+      "//third_party/libyuv:libyuv_config",
+      ":gpu_config",
+    ]
+    sources = [
+      "jpeg_decode_accelerator_unittest.cc",
+      "video_accelerator_unittest_helpers.h",
+    ]
+    if (use_x11) {
+      deps += [ "//ui/gfx/x" ]
+    }
+    if (use_ozone) {
+      deps += [ "//ui/ozone" ]
+    }
+  }
+}