Reland of Moves mojo_js_integration_tests into blink.

third_party/WebKit/Source/core/mojo/BUILD.gn

Index: third_party/WebKit/Source/core/mojo/BUILD.gn
diff --git a/third_party/WebKit/Source/core/mojo/BUILD.gn b/third_party/WebKit/Source/core/mojo/BUILD.gn
index d28d6fed806523c7e4737d98b8ea45e2bf17414f..fb415713f7212c43e9ba8ba8d9e948498af92adb 100644
--- a/third_party/WebKit/Source/core/mojo/BUILD.gn
+++ b/third_party/WebKit/Source/core/mojo/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("mojo") {
@@ -18,3 +19,39 @@
     "//mojo/public/cpp/system",
   ]
 }
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "tests/JsToCppTest.cpp",
+  ]
+
+  data = [
+    "tests/JsToCppTest.js",
+  ]
+
+  configs += [
+    "//third_party/WebKit/Source/core:blink_core_pch",
+    "//third_party/WebKit/Source:config",
+    "//third_party/WebKit/Source:inside_blink",
+  ]
+
+  deps = [
+    ":test_bindings_blink",
+    "//mojo/public/cpp/bindings",
+    "//testing/gtest",
+    "//third_party/WebKit/Source/core:core",
+    "//third_party/WebKit/Source/core:testing",
+  ]
+
+  data_deps = [
+    ":test_bindings",  # For JS bindings: crbug.com/729649.
+    "//mojo/public/js:new_bindings",
+  ]
+}
+
+mojom("test_bindings") {
+  sources = [
+    "tests/JsToCpp.mojom",
+  ]
+}