headless: Enable GL support by default

headless/public/headless_browser.cc

 // Copyright 2015 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 "content/public/common/user_agent.h"
 #include "headless/public/headless_browser.h"
 
 using Options = headless::HeadlessBrowser::Options;
 using Builder = headless::HeadlessBrowser::Options::Builder;
 
 namespace headless {
 
 // Product name for building the default user agent string.
 namespace {
 const char kProductName[] = "HeadlessChrome";
 }
 
 Options::Options(int argc, const char** argv)
     : argc(argc),
       argv(argv),
       user_agent(content::BuildUserAgentFromProduct(kProductName)),
       message_pump(nullptr),
       single_process_mode(false),
-      disable_sandbox(false) {}
+      disable_sandbox(false),
+      gl_implementation("osmesa") {}
 
 Options::Options(Options&& options) = default;
 
 Options::~Options() {}
 
 Options& Options::operator=(Options&& options) = default;
 
 Builder::Builder(int argc, const char** argv) : options_(argc, argv) {}
 
 Builder::Builder() : options_(0, nullptr) {}
@@ skipping 33 matching lines @@
 Builder& Builder::SetDisableSandbox(bool disable_sandbox) {
   options_.disable_sandbox = disable_sandbox;
   return *this;
 }
 
 Builder& Builder::SetProtocolHandlers(ProtocolHandlerMap protocol_handlers) {
   options_.protocol_handlers = std::move(protocol_handlers);
   return *this;
 }
 
+Builder& Builder::SetGLImplementation(const std::string& gl_implementation) {
+  options_.gl_implementation = gl_implementation;
+  return *this;
+}
+
 Options Builder::Build() {
   return std::move(options_);
 }
 
 }  // namespace headless