Add --headless flag to Windows

headless/public/headless_browser.h

Index: headless/public/headless_browser.h
diff --git a/headless/public/headless_browser.h b/headless/public/headless_browser.h
index 19694ec18af19b40f4e72857a1850a01b0745155..92b2610abd15be9500f13331b24a691e168aba85 100644
--- a/headless/public/headless_browser.h
+++ b/headless/public/headless_browser.h
@@ -22,6 +22,10 @@
 #include "net/base/ip_endpoint.h"
 #include "ui/gfx/geometry/size.h"
 
+#if defined(OS_WIN)
+#include "sandbox/win/src/sandbox_types.h"
+#endif
+
 namespace base {
 class MessagePump;
 class SingleThreadTaskRunner;
@@ -95,7 +99,7 @@ class HEADLESS_EXPORT HeadlessBrowser {
 };
 
 // Embedding API overrides for the headless browser.
-struct HeadlessBrowser::Options {
+struct HEADLESS_EXPORT HeadlessBrowser::Options {
   class Builder;
 
   Options(Options&& options);
@@ -107,6 +111,14 @@ struct HeadlessBrowser::Options {
   int argc;
   const char** argv;
 
+#if defined(OS_WIN)
+  // Set hardware instance if available, otherwise it defaults to 0.
+  HINSTANCE instance;
+
+  // Set with sandbox information. This has to be already initialized.
+  sandbox::SandboxInterfaceInfo* sandbox_info;
+#endif
+
   // Address at which DevTools should listen for connections. Disabled by
   // default. Mutually exclusive with devtools_socket_fd.
   net::IPEndPoint devtools_endpoint;
@@ -185,7 +197,7 @@ struct HeadlessBrowser::Options {
   DISALLOW_COPY_AND_ASSIGN(Options);
 };
 
-class HeadlessBrowser::Options::Builder {
+class HEADLESS_EXPORT HeadlessBrowser::Options::Builder {
  public:
   Builder(int argc, const char** argv);
   Builder();
@@ -200,6 +212,10 @@ class HeadlessBrowser::Options::Builder {
   Builder& SetDisableSandbox(bool disable_sandbox);
   Builder& SetGLImplementation(const std::string& gl_implementation);
   Builder& AddMojoServiceName(const std::string& mojo_service_name);
+#if defined(OS_WIN)
+  Builder& SetInstance(HINSTANCE instance);
+  Builder& SetSandboxInfo(sandbox::SandboxInterfaceInfo* sandbox_info);
+#endif
 
   // Per-context settings.
 
@@ -224,6 +240,7 @@ class HeadlessBrowser::Options::Builder {
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
+#if !defined(OS_WIN)
 // The headless browser may need to create child processes (e.g., a renderer
 // which runs web content). This is done by re-executing the parent process as
 // a zygote[1] and forking each child process from that zygote.
@@ -243,7 +260,17 @@ class HeadlessBrowser::Options::Builder {
 //
 // [1]
 // https://chromium.googlesource.com/chromium/src/+/master/docs/linux_zygote.md
-void RunChildProcessIfNeeded(int argc, const char** argv);
+HEADLESS_EXPORT void RunChildProcessIfNeeded(int argc, const char** argv);
+#else
+// In Windows, the headless browser may need to create child processes. This is
+// done by re-executing the parent process which may have been initialized with
+// different libraries (e.g. child_dll). In this case, the embedder has to pass
+// the appropiate HINSTANCE and initalization sandbox_info to properly launch
+// the child process.
+HEADLESS_EXPORT void RunChildProcessIfNeeded(
+    HINSTANCE instance,
+    sandbox::SandboxInterfaceInfo* sandbox_info);
+#endif  // !defined(OS_WIN)
 
 // Main entry point for running the headless browser. This function constructs
 // the headless browser instance, passing it to the given
@@ -251,7 +278,7 @@ void RunChildProcessIfNeeded(int argc, const char** argv);
 // the main loop, it will only return after HeadlessBrowser::Shutdown() is
 // called, returning the exit code for the process. It is not possible to
 // initialize the browser again after it has been torn down.
-int HeadlessBrowserMain(
+HEADLESS_EXPORT int HeadlessBrowserMain(
     HeadlessBrowser::Options options,
     const base::Callback<void(HeadlessBrowser*)>& on_browser_start_callback);