Port Chromium's blink_tests target to GN.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 265ddc066fd2b8f000fc3559885d42624a23dc59..f369a9ff25b73c952d1b0edd820df90b72f1caff 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -719,6 +719,58 @@ group("gn_visibility") {
   ]
 }
 
+if (!is_ios) {
+  group("blink_tests") {
+    testonly = true
+
+    deps = [
+      "//third_party/WebKit/Source/platform:heap_unittests",
+      "//third_party/WebKit/Source/platform:platform_unittests",
+      "//third_party/WebKit/Source/web:webkit_unit_tests",
+      "//third_party/WebKit/Source/wtf:wtf_unittests",
+    ]
+
+    if (is_android) {
+      deps += [
+        "//breakpad:dump_syms($host_toolchain)",
+        "//breakpad:minidump_stackwalk($host_toolchain)",
+        "//content/shell/android:content_shell_apk",
+      ]
+    } else {
+      deps += [ "//content/shell:content_shell" ]
+    }
+
+    if (is_win) {
+      deps += [
+        #'../content/content_shell_and_tests.gyp:content_shell_crash_service', TODO(GYP)
+        #'../content/content_shell_and_tests.gyp:layout_test_helper', TODO(GYP)
+      ]
+    }
+
+    if (!is_win && !is_android) {
+      deps += [ "//breakpad:minidump_stackwalk" ]
+    }
+
+    if (is_mac) {
+      deps += [
+        "//breakpad:dump_syms($host_toolchain)",
+        #'../content/content_shell_and_tests.gyp:layout_test_helper', TODO(GYP)
+      ]
+
+      # TODO(GYP): Re-enable this as soon as we can link Blink binaries on mac.
+      deps -= [
+        "//third_party/WebKit/Source/platform:heap_unittests",
+        "//third_party/WebKit/Source/platform:platform_unittests",
+        "//third_party/WebKit/Source/web:webkit_unit_tests",
+      ]
+    }
+
+    if (is_linux) {
+      deps += [ "//breakpad:dump_syms($host_toolchain)" ]
+    }
+  }
+}
+
 if (is_linux) {
   # This group corresponds to the list of tests run on the waterfall for
   # desktop Linux GYP builds from testing/buildbot/chromium.linux.json. It's