Initialize RenderSandboxHostLinux in --no-zygote mode to not crash.

content/zygote/zygote_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 <string>
 #include <vector>
 
+#include "base/command_line.h"
 #include "base/strings/string_split.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 
 namespace content {
 
 class LinuxZygoteBrowserTest : public ContentBrowserTest {
  public:
   LinuxZygoteBrowserTest() {}
@@ skipping 12 matching lines @@
   std::string result;
   ASSERT_TRUE(ExecuteScriptAndExtractString(shell(), kTestCommand, &result));
   std::vector<std::string> parts = base::SplitString(
       result, "()", base::KEEP_WHITESPACE, base::SPLIT_WANT_ALL);
   ASSERT_EQ(3U, parts.size());
   EXPECT_FALSE(parts[0].empty());
   EXPECT_FALSE(parts[1].empty());
   EXPECT_TRUE(parts[2].empty());
 }
 
+class LinuxZygoteDisabledBrowserTest : public ContentBrowserTest {
+ public:
+  LinuxZygoteDisabledBrowserTest() {}
+  ~LinuxZygoteDisabledBrowserTest() override {}
+
+ protected:
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    ContentBrowserTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitch(switches::kNoZygote);
+    command_line->AppendSwitch(switches::kNoSandbox);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LinuxZygoteDisabledBrowserTest);
+};
+
+// https://crbug.com/712779
+#if !defined(THREAD_SANITIZER)
+// Test that the renderer doesn't crash during launch if zygote is disabled.
+IN_PROC_BROWSER_TEST_F(LinuxZygoteDisabledBrowserTest,
+                       NoCrashWhenZygoteDisabled) {
+  NavigateToURL(shell(), GURL("data:text/html,start page"));
+}
+#endif
+
 }  // namespace content