[headless] Make browser service manifest overlay configurable.

headless/lib/embedder_mojo_browsertest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 #include "base/optional.h"
 #include "base/path_service.h"
+#include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
 #include "content/public/test/browser_test.h"
 #include "headless/grit/headless_browsertest_resources.h"
 #include "headless/lib/embedder_test.mojom.h"
 #include "headless/public/devtools/domains/network.h"
 #include "headless/public/devtools/domains/page.h"
 #include "headless/public/devtools/domains/runtime.h"
 #include "headless/public/headless_browser.h"
 #include "headless/public/headless_devtools_client.h"
@@ skipping 24 matching lines @@
   EmbedderMojoTest() : EmbedderMojoTest(HttpPolicy::DEFAULT) {}
 
   explicit EmbedderMojoTest(HttpPolicy http_policy)
       : browser_context_(nullptr),
         web_contents_(nullptr),
         devtools_client_(HeadlessDevToolsClient::Create()),
         http_policy_(http_policy) {}
 
   ~EmbedderMojoTest() override {}
 
+  void SetUp() override {
+    // Set the manifest overlay before it is requested during main thread
+    // initialization.
+    options()->mojo_service_manifest_resource_id =
+        IDR_HEADLESS_EMBEDDER_TEST_MANIFEST_OVERLAY_JSON;
+
+    HeadlessBrowserTest::SetUp();
+  }
+
   void SetUpOnMainThread() override {
     base::ThreadRestrictions::SetIOAllowed(true);
     base::FilePath pak_path;
     ASSERT_TRUE(PathService::Get(base::DIR_MODULE, &pak_path));
     pak_path = pak_path.AppendASCII("headless_browser_tests.pak");
     ResourceBundle::GetSharedInstance().AddDataPackFromPath(
         pak_path, ui::SCALE_FACTOR_NONE);
   }
 
   // HeadlessWebContentsObserver implementation:
@@ skipping 176 matching lines @@
   void OnLoadingFailed(const network::LoadingFailedParams& params) override {
     // The navigation should fail since HTTP requests are blackholed.
     EXPECT_EQ(params.GetErrorText(), "net::ERR_FILE_NOT_FOUND");
     FinishAsynchronousTest();
   }
 };
 
 DEVTOOLS_CLIENT_TEST_F(HttpDisabledByDefaultWhenMojoBindingsUsed);
 
 }  // namespace headless