Add pixel_browser_tests target.

The target will be added to an internal bot to run on CI.
This target is for pixel testing for desktop ui.

Bug: chromium:958242
Change-Id: I390d2507a5c0abeedb95458132fe9913ae0a98fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614150
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660623}

chrome/test/BUILD.gn

@@ -297,6 +297,13 @@ static_library("test_support") {
     ]
   }
 
+  if (is_win) {
+    sources += [
+      "pixel/skia_gold_pixel_diff.cc",
+      "pixel/skia_gold_pixel_diff.h",
+    ]
+  }
+
   if (toolkit_views) {
     public_deps += [ "//ui/views:test_support" ]
     sources += [
@@ -3077,6 +3084,13 @@ test("unit_tests") {
     }
   }
 
+  # Pixeltests only support win.
+  if (is_win) {
+    sources += [
+      "../test/pixel/skia_gold_pixel_diff_unittest.cc",
+    ]
+  }
+
   if (!is_android) {
     sources += [
       # CRLSets are not supported on Android or iOS, but available on all other
@@ -6047,6 +6061,27 @@ if (is_win) {
   }
 }
 
+if (is_win) {
+  test("pixel_browser_tests") {
+    sources = [
+      "pixel/demo/skia_gold_demo_pixeltest.cc",
+    ]
+    configs += [ "//build/config:precompiled_headers" ]
+    defines = [
+      "HAS_OUT_OF_PROC_TEST_RUNNER",
+    ]
+    deps = [
+      ":test_support",
+      ":browser_tests_runner",
+    ]
+    if (is_win) {
+      data = [ "//tools/skia_goldctl/goldctl.exe" ]
+    } else {
+      data = [ "//tools/skia_goldctl/goldctl" ]
+    }
+  }
+}
+
 # Test binary for the ChromeOS usage time limit processor tests.
 if (is_chromeos) {
   test("usage_time_limit_unittests") {